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Andrew, for the inserts in the ends of the tubes, I used propell nuts from Carbatec, forced into wooden blocks cut to fit into the tubes and glued with araldite. I also used the propell nuts to mount the alt rings with a wooden block pushed up inside the tube to take the crushing forces.
Alistair, the helical crayford is from Kineoptics in the US. I initially bought the 2" unit but have decided that the lighter 1.25" would be better. It will not be a big deal sticking to the smaller barrel eyepieces, and will make balancing the scope easier, I haven't a pic of it stowed as I'm not sure how far I want to dismantle it. The major sticking point is the secondary mirror mounting - if I don't mind a major recollimation, it's a doddle!
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