I have an *old* Marin Palisades (1993?), and am having difficulty with the handlebars...
The top alloy insert into which the bolt holding the handlebars tight sits (threaded headset) - has sheared in two (due to overtightening) - leaving the headset bolt untensioned (nothing to support it in tube!)
Short of finding a large washer(!) - What would the best remedy be, please? - as I don't want to replace the stem (it's nicely colour co-ordinated - luminous yellow - with the front forks and handlebars...)