Here is a goal: How to attach clay pots together?

Which way makes more sense to accomplish this goal?

Choose from: i. Use a nail and nut to pass through the hole at the bottom of the clay pot and use a washer to block the holes completely both inside and outside the pots. Align the two smaller clay pots together and connect with a butterfly nut.. ii. Use a screw and nut to pass through the hole at the bottom of the clay pot and use a washer to block the holes completely both inside and outside the pots. Align the two smaller clay pots together and connect with a butterfly nut..
ii.