Thread: Why, Why, Why....
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Old 03-20-23 | 01:58 PM
  #21  
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terrymorse
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Originally Posted by work4bike
The only difference is that the allen size for the two top cap screws are about a 1/2-mm larger. I'm guessing they're 3.5-mm screws, but I don't have a 3.5mm allen wrench in my tool kit. The bottom (long bolt) is a 3-mm allen and on my old mirror assembly the 3-mm allen fits all 3 screws.

There is absolutely no perceived difference in assembly, using the larger allen wrench..
There isn't an ISO metric socket screw size with a 3.5 mm hex socket size. M4 uses 3mm hex, M5 uses 4mm hex.

I don't know what you have there that might be between 3 and 4 mm hex. An ANSI screw?
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