he may be talking about the bowl gasket on a monoblock, in that case it's very likely the lid is warped where the screws are over tightened,
when it is a warped cover lid I put the lid in a lathe and take a small cut off of it to get it back to being flat.
when it is a warped cover lid I put the lid in a lathe and take a small cut off of it to get it back to being flat.
