----- Original Message -----
From: "Jay Sexton" <firstname.lastname@example.org>
> I want to re-tap French threaded Mod 93 cranks to English....... It was suggested to run the tap from the backside of the crankarm. Why would
> this be?
I think your results will be best if you pre-drill or ream the hole first to a proper base ID for the 9/16" x 20tpi English tap, although it shouldn't take much. I believe taping from the backside of the crankarm will leave a cleaner thread start from the pedal side once your finished.