Unfortunately the grease cabinet for the AMC 20 flat does not work. There's almost no 1/4" thick piece of material around the screw holes. There's no way to seal the lid with a grease cupboard without a couple of RTVs. If they want to fix the structure, they'll have to make it protrude past the factory case. Indentation and glue the foam rubber ring inside to match the body.Then it would be perfect!It's easy to change the design to be honest.Even a big rubber ring will work if it's attached to the grease cabinet.