Senior Member
Join Date: Dec 2016
Location: Long Island, NY
Posts: 2,111
Bikes: Trek 800 x 2, Schwinn Heavy Duti, Schwinn Traveler, Schwinn Le Tour Luxe, Schwinn Continental, Cannondale M400 and Lambert, Schwinn Super Sport
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I've side stepped the issue on '80's bikes by getting Kalloy seat posts if they came with this type of clamp. On my few bikes that have these clamp, I tighten the #$%@ out of it with a pair of open ended wrenches.