smallspy
Senior Member
Its possible because the ring is a universal design, all with a slight taper. if you want a straight section, you oppose the tapers from one ring to the next. You build up the tapers to achieve a particular curve in any direction (up, down, side). At least I think it was a universal ring design.
That's precisely the case. There are 7 individual sections which are bolted together to make up a ring, and something like 17 different permutations in terms of how they can be arranged to allow them to run straight or various curves.
Dan
Toronto, Ont.