Hi,
nice you got a good scope at a good price - my older and non-multicoated example of TSN-3 with the SDLv2 also performs quite good even in comparison to current alphas and thus no plans to upgrade...
Yours seems to be a fairly rare late example with multicoatings and the protective glass below the bayonet mount and in front of the prism - interesting to hear that the HDF zoom fits in there...
It would be great if you could post an image of the printing on both sides of the body and maybe measure the distance from the top of the eyepiece bayonet mount to the protective glass and the distance of the front element mount of the eyepiece (the end which goes into the scope body) to the lower end of the union nut holding the EP.
These two measurements are crucial if you want to fit a non-standard EP like the Optcron EPs in there.
PS: since you cannot really use the adjustable tripod collar if the scope is in the SOC, I would not bother to try to loosen the bent screw. If you need to, it's probably easy enough to carefully loosen it with pliers and replace it with a regular screw of the same size... although that will probably not be black and not quite as nice to use as the knurled edge original.
Thanks and enjoy your scope,
Joachim