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Thanks Martin and Neville
I hadn't thought of the corrosion or rust damn it, although im aware of electrical differential causing breakdown. It was hovering in the back of my mind for a little while but I barged on regardless.
Im not doing this all again, but i will bury everything in metal paint now. This should last until i leave this mortal coil.
I had thought of rolled tube, done by a local shop, but it sounded expensive, i didnt realise it would be that cheap!. I dont have a router or be able to make a slot accurate enough for the ring either.
Ive tested a concave roller on this rail, very smooth and friction free, better than i thought, so I bought a bunch, adjustable.
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