My first thought was some long shifters fitted to the bolt heads and a big stick to reach down and move them back and forward
But - questions, questions??? Will having a chain hanging off the upper part of the collimation bolt lead to some slight movement as the scope is moved in Alt? Perhaps I will need the chain in a degree of tension to avoid this? But might that make it difficult to turn? As some I you know, I trained as a chemist, certainly not as an engineer!
Still seaching for suitable lightweight/thin chains and sprockets. I'm off to a Radio Controlled hobby shop that is advertising chains and sockets, but won't get there until next week. I don't think industrial will do - too big and heavy. Perhaps the thinnest bicycle chains and sprockets - 3/32" I believe - but they are probably super titanium racing ones worth mega bucks?
Tomorrow morning, I stop at my friendly roller bearing supplier with my piece of Bunnings 1/4" steel shaft in hand to see what bearings I can buy.
Watch this space!
But I'm going to have to be very confident before I take the electric drill to the wooden mirror box
(Please no-one tell Peter - hush now)