Handlebar won't stay tight
#26
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Are there serrations or some kind of knurling on the center area of the bars?
What type of metal are the parts made out of?
I have a feeling that as an adult reliving his childhood, you're pushing the parts far beyond their design specs.
A steel stem might just grip the bars along the edges of a clamp, while an aluminum stem may grip the whole width of the clamp.
#28
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I had the same problem. Someone suggested puting a piece or two of aluminum foil as a shim. I crinkled it first, then flattened. It worked well.
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#29
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This thread should be deleted as there’s a ton of terrible advice on here.