Ok, there's 4 main little pieces that put the pot on the PVC. I'll show diagrams of each little piece. The way I do it, makes it possible to make all the pots at one time, and then put them on at one time, so as not to be bogged with constantly maneuvering the PVC frame. I can't make it any easier than this rushed diagram I just drew. If it's not screwable, then cement it, and once all pieces are in place, go over it with plumbers putty. Fill with water, watch for leaks, and repeat with putty. {{The key is jamming the small 1" cap [Part #4] onto the male end [Part #3] that is jammed through the 4" cap. Believe it or not, with all the jamming, there is an incredibly strong seal. Here's also the under shot of the pot, doesn't look like much because of the putty that is coated on it. If I missed anything let me know. Hope this helps Gen.