People have simply retapped, with reverse threading, and gotten useable results. Obviously inferior in terms of the strength of the threads but it has been done.
"Helicoil" is a brand new for a threaded insert - the pedal hole is drilled out, the insert with reverse threaded installed, and off you go. That's what I ride.
-S-
GPVB1@cs.com wrote:
>
> In a message dated 7/1/01 10:12:15 PM Eastern Daylight Time,
> steve@fridayscomputer.com writes:
>
> > I have never heard of Campy tandem cranks in 172.5. Can anyone confirm
> > these were made this way and not redrilled or helicoiled single-bike
> > cranks?
> >
> > Steve "rides 172.5 helicoiled cranks on my tandem" Freides
> >
> >
> >
>
> Hi Steve:
>
> We've covered this issue before. Campy made any length in tandem cranks, but
> you had to order it. My other set is 165 / 167.5!!
>
> This is a factory-made tandem set - the arms with the reverse threading have
> the "S" and "D" stamped in them - how could you tap a reverse thread of the
> same diameter into something BTW?
>
> Cheers,
>
> Greg