Hi Steve!
Just a handy hint re:turning the tube in the rings...buy a pack of those self-adheisive rubber pads..get a pack of the larger variety...cut a few into strips about 1cm wide..stick a few of them onto the tube either side of the and against the tube rings to keep it in place when you loosen off the tube rings. This will help keep the the tube in it's balance point whilst rotating the tube...(I've made an Alt-atz mount using tube rings to make viewing more comfortable...I just rotate the tube for a better angle)
Cheers!
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