Most of us will try to be pertinent and constructive. I have one of Tom Clarks Tectrons. It is very much the same construction of yours. I'll get pictures of the tubes, the ends, the fittings etc. but not today, too late now.
First, the truss tubes on mine are definitely too small a diameter. To try and be constructive with some follow through, I suggest you look into some design specs for dob truss tubes. Your smaller scope may have the correct size tubes. Is your mirror box completely enclosed by modern standards, with some small vent holes in the back? You can open the back some, being careful of what is structural. Ventilation is critical in these boxes.
On the bright side, my mirror is a good one. A lot of Tom's mirrors came from Vaughn Parsons, Inter Mountain Optics (IMO, not OMI). Just about every make and model of scopes will have some hit and miss mirrors. There was some recent discussion about the 42" mirror not being so good that is Tom's personal scope. It was refigured. Tom has retired Tectron some time ago so you might as well look into parts and modifications from any and all sources. I don't think there is an intrinsic value for originality here. Back to my mirror: It's a 36" F4.65, Tom's second largest production scope. The largest was a 36" F5. The focal lengths are another whole story. I took my mirror to Swayze who I know as a good acquaintance. I've been to his shop in Portland a few times. The first thing he said on the bench was "I don't know about the other mirrors but this is a good one". Swayze also stated "...more than diffraction limited..". Not perfect, none are. With some discussion time it was determined that the expense of stripping, figuring, and recoating wasn't going to be worth what may not even be a respectable difference in a side by side view test if a 'before and after' could be done.
First and foremost, use your experience to see it the images are what you like. Move to testing AFTER that if you desire, it's a wise order.
Note on big glass, as a rule Swayze no longer does 36" work.
Edited by apfever, 23 May 2019 - 08:07 PM.