user: In one sentence, describe what the following article is about: One of the best things about a drop spindle is that it is relatively easy to make and to use. If you decide to go this route, then you can make your own drop spindle without much cost. Gather the materials listed below.   A one-foot long wooden dowel. Although size isn't that important, a recommended diameter size is 3/8 of an inch. This will act as the main shaft for the spindle. A hook, or wire that can be bent into a hook. You'll make sure to hook your yarn through here. Two heavy CDs to act as the whorl. Rubber grommets that match the diameter of your dowel. You can get these at any farm store or auto part store. So if the diameter of your dowel is 3/8 of an inch, the inside hole (bore diameter) should be 3/8 of an inch, the panel hole should be 5/8 of an inch to match the hole in the CDs, and the outside diameter should be about 7/8 of an inch. Get a serrated knife, or small saw and scissors to cut the dowel. To do this you'll need to make a hole in the center of the dowel with a pushpin. Screw the cup hook into the hole so that it will stay in place. You want the grommet to fit snugly in the center of the CDs. This can be a little frustrating since it's a tight fit, but once you've pulled the edges of the grommet up, it should be good to go. As long as you've judged the sizes correctly you should be finished making your drop spindle. If it doesn't quite fit, wrap the dowel with electrical tape until the dowel and CDs slip on and fit tightly. For a beginning spinner, one piece of roving is going to be too big. Break that piece down into sections that are about 12 inches (30.5 cm) long. Carefully split your roving down the middle to form two strips instead of one. This will make spinning easier if you're just beginning. Your leader is a piece of yarn about 18 inches (45.7 cm) long that's tied onto the spindle shaft right above the whorl (the CDs). Put the yarn over the whorl and loop it around the shaft underneath. Put it back over the whorl and secure the end to the hook. Letting the spindle hang beneath your hand, suspended by the leader, take the spindle in your right hand and the leader in your left hand. Spin the drop spindle from the dowel (or shaft) in a clockwise direction.   Repeat this process in the same direction until the leader begins to take in the twist. You'll leave a fluff of fiber at the end so you can join on more fiber. It's a good idea to practice making the spindle rotate, so that you get a feel for the direction you'll be spinning the drop spindle to make the yarn. Keeping tension on your spun yarn, allow the twist to run into the newly drafted fiber. Keep repeating this process and check that there is enough twist before you move on. When the yarn is long enough that the spindle almost touches the ground, unhook it and wrap it around the base of the spindle next to the whorl.   This is called a single. You'll want to leave enough yarn unwound so that you can slip it back on the book with a couple of inches to spare. If you find that the yarn is pulling apart or too slack, spin your spindle again to store more of the twist. Overlap the wool a few inches of the fluff of drafted fibers, so that you can catch and twist more onto the leader. Allow the twist to run into the joined fibers, adding more twist by spinning the spindle, because you want to make sure that your join is secure.   To test the join, give the spindle another twist and bring your right hand back to where the left hand holds the yarn. Move your left hand back about three inches, as you pull and draft out more fibers of wool and allow the spindle to turn a few times. Release the yarn with your right hand and left the twist move up into the fibers as you did previously. Now, gently pull more fibers from the fiber mass by pulling back with your left hand, and allowing the twist to run into the drafted fibers.
Summary: Collect your tools to make a drop spindle. Insert cup hook into the top of the dowel. Insert the grommet into the hole between two CDs. Slide the dowel into the center of the grommet. Prepare your roving. Tie on your leader. Spin the fibers. Wind on new fiber. Join more fiber.

Problem: Article: Note that you can label the first cell of rows and columns, bolding the text of initial cells to set them apart from the numeric data that follows. You'll find columns going all the way to the letter Z and as many as 1000 rows initially. You can also add more rows by scrolling to the bottom and clicking the Add button. It's followed by a text box (and text saying "more rows at bottom") that allows you to specify how many rows you wish to add. To manipulate entire rows (delete, hide, copy and paste, etc.), right-click the number of the row and select your preferred function from the menu that appears. To perform similar functions to entire columns, click on the dropdown arrow that appears when your cursor hovers over that column's letter.  You may also move or delete a row or column by selecting its number or letter (respectively) and selecting the Edit tab from the toolbar. You may add a new row or column to a specific location by selecting any cell contained therein and clicking the Insert tab from the toolbar. You'll see options to insert rows or columns above or below and to the right or left of the selected cell. To format an entire row or column, select its corresponding number or letter. To format a single cell, select that cell. Once your desired dataset has been selected, you may either click the Format tab or select from several formatting options (Font, Font Size, Bold, Italics, etc.) along the toolbar.  The Format tab and toolbar will also allow you to determine the alignment and text wrapping for text or data within a cell, row or column. By selecting multiple cells (horizontally or vertically), you will also discover the option to Merge Cells on both the Format tab and toolbar. To adjust the way numbers are represented within a cell, row or column, note that there's a Number subsection under the Format tab. This allows you to show numbers in a variety of ways (currency, percentages, etc.). You'll also notice several commonly used number formatting options along the toolbar, as well as a small dropdown menu for additional number formats. After selecting your desired dataset from specified cells, rows or columns, you may then sort or filter that data by clicking on the Data tab. You can even name ranges of data for easier reference. Various visual representations can be useful when attempting to help others better understand your data. You can find the option to place charts, images, links, forms and drawings near the bottom of the dropdown menu that appears after selecting the Insert tab. Google Sheets' ability to perform calculations is one of its more useful capabilities. You'll find Functions under the Insert tab and at the far, righthand side of your toolbar. Clicking the toolbar button will reveal several commonly used functions (SUM, AVERAGE, etc.) along with an option for More Functions at the bottom of the dropdown menu.  Google Sheets offers most of the same functions users find in Microsoft Excel, so those already experienced with the software should find Sheets to be pretty familiar. More advanced users can also create their own functions using Google Apps Script. You can find a more complete tutorial on doing so here: https://developers.google.com/apps-script/guides/sheets/functions#getting_started.
Summary:

assistant: Enter data in rows and/or columns. Adjust rows and columns. Format cells, rows or columns. Organize data. Insert graphics. Perform functions.