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Thanks Doug
I assume the black knobs are the "locking" knobs? I found the best way to use these was remove them from the scope and find a large deep lake to throw them into! That is provided the springs are strong enough to hold collimation.
When I used them I would back them of, carefully collimate using the main screws then tighten the locking knobs and end up re-collimating only this time using the locking knobs!
The only reason they are there is if the spring are incapable of holding the mirror which the ones on the model scope i have definitely were not.
Malcolm
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