Join Date: Oct 2004
Location: A land that time forgot
Bikes: the ever shifting stable loaded with comfortable road bikes and city and winter bikes
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The new (maybe always?) Trek 520 forks have unthreaded mid fork eyelets, no M5 screw is going to engage, there's no threads in the the fork. You need to thrubolt that one.
Head on down to the hardware store. I think 1 1/2" is too short, the 2"s are a little long, but you can trim them with a bolt cutter.