First determine how much to tall the bucket is. Cut 1" above the bottom of the bucket all the way around so you now have a tray(if you will)from the bottom piece, next trim off how much the bucket is to tall from the cut you made to remove the tray from the upper bucket. Measure a 1"cut up each corner of the rest of the bucket from the bottom corners. Cut at each corner the 1" which will allow the top to flex into the bottom tray tightly. Shoe goo it or small screws or both and you've got it.
