Quoted message said:
Whether it is attached or not won't make any difference, the radial
fit in the recess is not a press fit and will fret radially as pedal
forces push it across its contact face. I have seen washers used in
this place that just created another interface but did not prevent
motion at the face and in the spindle threads.
ISTR you're not a Loctite fan, Jobst. Nonetheless, I wonder if a
strong Loctite compound would help if it were used to bond the washer
to the crank face.
I also wonder if a super-weak Loctite formula would help on the pedal
threads themselves...
Come to think of it, the pedal threads don't need the adhesion of
loctite, since (in my experience) they're generally quite difficult to
remove as is. But they might benefit from something to fill the
clearance, as Loctite does, and reduce the motion that causes the
fretting. Perhaps teflon tape? It's done wonders for my bottom
bracket.
All in all, I think your countersunk pedal interface is a superior
solution, but it's much more difficult to apply to the millions of
existing cranks. A loctited washer and some teflon tape might be a
feasible shop solution.
- Frank Krygowski - (who's never broken a crank)