McMaster doesn't sell gaskets for their angle rings
. DAMN!!
I understand a lapjoint's purpose now after reading so much about it
. And your right it isn't well suited for my application. I only referneced it becuse it was the closest thing to what I was looking for that I was able to find. I saw in one of the pics I found of them that it had a lip, but didn't appear to be big enough. I did not know the proper name or even know where to look. I didn't think hvac and industrial supply places had someting as close as what I was looking ro find. Through it wouldn't have mattered cause I don't know of many industrial supply places anyway
The only exhaust ad duct flanges I found at the hardware store were flimsy sheet metal with a big box on one end and ruffled sheetmetal edge on the other.
I hope that link you posted doesn't count as posting sources. I don't think it should if it matters to the moderators. It's not a chemical precursor or anything. Anybody could have a million uses for a glovebox.
I thank you as well for your help.. Hopefully you won't get bad karma now
. I think that the hardest part now is finding an 8" hole saw
?? I see some six inch, but I'm not sure that they are made to cut through 1/2" plexiglass. I don't think they would cut through 1/4" plexiglass. Maybe I'm wrong? Maybe if I just mount the hole saw in a drill press and clamp the plexiglass down it should cut through?? I just don't think the teeth are fine enough to cut without chipping the plastic.