Yes! If you're having trouble putting a clarinet together, cork grease will make it much easier for you to assemble everything. Look in your case to see if you can find any cork grease. I love cork grease; it's a game-changer. When I'm teaching little kids how to play the clarinet, I always explain to them: it's like a chapstick but for your clarinet.  When you're applying cork grease, make sure to only apply a little bit. You don't want to make it all greasy. You don't want to put the cork grease on the body of the instrument! But, you can apply a little bit of cork grease to the cork part of the instrument. When you're applying the cork grease, put on a light layer. You'll find when you put the two pieces back together, they fit together much easier!