Why not use an adjustable strap with a bag of fishing weights? then you can adjust it as neccessary.
The weight placed the same distance from the bearing as the mirror is (on the opposite side of the bearing of course) will enable a state that stays in balance. Once you know what that is in weight, you can make up a nice neat counterbalance pod that won't ugly you out every time you see it.
My camera and chunky diagonal need 1.6kilos to balance on my SCT, it hangs like a little scrotum under the front of the OTA. Looks ever so cute...
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