well i made my own pots on a wood lathe...i kinda have a wierd hidden talent for wood work and understanding stuff....so the inside i visuallized....and just made it on a wood lathe....turned out kinda big....but not bad for a first attempt.....he cut the glass out of an old window pane i think....he used the little glass cutting tool....not sure what its called....we traced my circle alumanum with a sharp sharpie...and the tool like cuts a line in the glass....then you snap the pieces off....you cant cut a circle out out the middle of a piece of glass like they do in cartoons...its imposible.....so he made like reliefe cuts and cut off smaller pieces and snapped them off as he went...it worked good....hes been cutting glass for years and years though....i can do lines easy...run the little circle cutter edge and snap it off...i dont have my glass call in order....i was trying to tune it and took it apart...and when i was regluing i busted it AGAIN....but i have a slate i made....ill take a pic and post the link here in a minute....