Well, having got the Atco 14 going yesterday and feeling pleased with myself, today I fell into the trap of tinkering. I decided to clean up the exhaust silencer, as it's well rusted. Moderate pressure to remove the nut sheared the bolt on the exhaust stud. I can get a replacement stud, but I'm having no luck removing the rusted one. I've tried some Plus Gas, tried some gentle heat. Any advise?