At 09:09 PM 2/16/2010, Walter Houle wrote:
>installed a new crank but I can't tighten the screw more than a couple of
>turns before it jams. Does anyone know the thread size? Is it OK to clean
>them up by inserting a tap?

M5 x 0.8 flat head, just measured it.  I'd make sure the screw is the
right size before messing with the hole.  Should be no trouble
running a tap in there, but you'll need a bottoming tap, or shorten a
regular plug tap* because the hole is not very deep.

*Go very carefully if it's a carbon steel tap so as not to soften the
metal.  If it turns blue or even straw-colored it's too late, and
just grinding the color off won't fix it.

Yours,
David