Except these wont work on the F/6.3. The F/6.3 uses a MUCH longer screw.
Looking in astroarchive, it indicates that the F/6.3 is about 3.25" long.
That is a very long slender screw. You would be hard pressed to buy the
thumb screw as a single piece that way (unless you buy them from Chris
Heapy). However, you could get some ordinary socket head cap screws that
fit the description and press some knobs onto them. McMaster does sell the
knobs only for about $15.00/100, so you will have plenty of spares. Let me
say though, that this info is just from the archives. I have never seen an
F/6.3 collimation screw with my own eyes.

Phil


> ----------
> Sent: Wednesday, December 01, 1999 11:55 PM
> Subject: [M]: Re: Thumb Screws for Collimation (again)
>
> I have seen it posted here although I have not ordered any yet.
> The screws are 6-32
> From McMaster Carr
> P# 91746A128
> Description: #6-32 Size x 1/2" Long, 1/8" Height, 3/8" Diameter, 18-8
> Stainless Steel Knurled Head Flat point thumb screws.
> Should be $10 ppd.
> #6 washers or 1/8" nylon spacers may be required
> _________________________
> Joe Torelli
> Momark Products Inc.
> Mansfield, Texas
> N32.32.860
> W97.10.520
>
> -----Original Message-----
> Date: Wednesday, December 01, 1999 7:14 PM
> Subject: [M]: Thumb Screws for Collimation (again)
>
>
> >I asked this a while back and got no replies, so here goes again.
> >C'mon, someone give me a clue! I'd rather buy the screws before I
> >pull the old ones out (one at a time of course, but nevertheless...).
> >
> >I think I'd like to replace my collimation screws, but I don't
> >remember the spec for the screw. 6/32 I believe, but what is the
> >length?
> >
> >If anyone has the spec for the collimation screw for the 10" f/6.3
> >I'd appreciate it.
> >
> >Cheers,
> >Tom Wideman
> >Grapevine, TX
> >
> >
>
>
>

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