Beg, make or buy threaded barrel for a diagonal?

I have a 2" SCT diagonal (sold the SCT, kept the accessories) that doesn't mate to my MK67 Mak because the mak has a drawtube whereas my diagonal has a visual back type screw on thread.

That half of the diagonal comes off, and looks like it could take a threaded barrel which would make it like a 'regular' diagonal after all, and so I could keep it instead of having to by a new one for my Mak. I guess it's a 2" ID but threaded on the outside piece of tube.

Does someone here have such a thing hanging around they could give/sell me? Could one be made easily (not by me, but you know)? If your advice is to have me find a machinist...what should I tell them: dimensions please, and material to use (unlikely I'll find a machinist/astronomer 2-in-one so any specifics will help). One note: the MK67 is notorious for needing a 'little extra' back focus, so, if I CAN specify length, i'd probably add 1/2" over whatever 'regular' length of these things is (what is 'regular length' by the way for these?)

Thanks for any dimensions? freebies? advice? whatever you got...THANKS!

Tom.

Hi, Tom.
Couple questions:

What brand/model is your SCT diagonal?

What's the inside diameter (as near as you can determine) of the socket you exposed when the barrel was removed (i.e. what's the outside diameter of *that* end of the barrel? You said "I guess it's a 2-inch ID but threaded on the outside..." (just want to make sure we're understanding what you're finding).

Depending on the diameter and threads, you may be able to simply use an existing SCT push-fit adapter, a standard diagonal barrel (from the same brand/company), or maybe an eyepiece barrel. If so, one of those items can be had fairly easily & cheaply.

Regarding the MK67 -- that infamous back focus concerns 1.25-inch diagonals, for the most part. A 2-inch diagonal should "gobble up" that extra back focus very nicely, so I wouldn't expect it to need an extra-long 2-inch diagonal barrel at all.

I think we can figure some things out and help determine your best (most convenient) course of action.

Best wishes and luck.
-Dan

My advice would be to stop and think what is going to be easiest to do and yet have a high probability of a good outcome. I'm thinking that you're better off eating the difference between the sale price of your SCT diagonal and the buying price of your 2" refractor-style diagonal (new or used) than trying to jury rig something.
--
Mike