At 09:35 AM 3/9/2009, Gene Baraff wrote:

>--- In <mailto:80f5%40yahoogroups.com>80f5@yahoogroups.com, "Gene
>Baraff" <g2baraff@...> wrote:
> >
> > The mounting shoe on the Skywatcher ST80 has four holes threaded
> to receive screws from below.
> >
> > Two of these holes are tapped 1/4 - 20.
> >
> > What is the thread size of the other two?
> >
> > ******************
> >
>They are 12-24.
>
>Gene Baraff


Those may be M6 - double check before tightening too hard... M6 has
a 25.4TPI thread (1.0MM pitch) and is a little bigger than 12-24, so
there may be a one-way fit pseudo-compatibility, but there won't be
good thread engagement.

Whitney