Yes Chris - rather like I described, but such that you can't even use some sort of forceps directly to get hold of the sec mirror, cos of the vane assembly that the central screw and the 3 surrounding one are on - this blocks your access!
But necessity is the mother of invention: when I speak of forceps, in the jewellery trade (which I used to ply) we had long, bent spring loaded tweezers that I reckon you could insert from the open end of the scope tube and get around the obstacle to grasp whatever the sec mirror is mounted onto, hopefully to turn/rotate it.
This may sound silly and it may well be, just throwing ideas/possibilities for you to consider or work/bounce off!
Regards, Darryl.
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