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From my side as an aircraft mechanic when younger. Acrylic does not like solvents or ammonia. I causes it to craze. The off gassing of some of the solvent could contribute to that but after a lot of use. I also agree with Bob about the hole not being smooth. Best way is to have the fitting in the side of the chamber instead of the lid but then it reduces the height of stuff in it. PVC is harder to find but is a better product and that is what Curtis (Cactus Juice) makes his vacuum chambers from. If you moved the fittings you could use very thick (20mm to 25mm) tempered glass. If the seller/maker won't replace the lid I would take the fitting off and polish the hole and underside to remove the crazing. Wet and dry used with water, followed by micro mesh can remove the crazing for a while.


Pete


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