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Join Date: Feb 2012
Location: Rochester, NY
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Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
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You could flip over the end washer so the "good" side was pressing against the post end. These pivot boss bolts don't require much tightening torque. there's almost no force trying to unthread or pull/push on them. You can sand down/file down the post shaft a touch.
I've seen the top ends of the shaft slightly bulged before, lots of corrosion build up also. I often wrap sand paper around the shaft and shoe shine it clean. I also have experienced the arm tightening on the shaft with bolt tightening, usually sanding and careful tightening (one of the few places I'll use thread locker compound) solve the problem well enough. Andy.