Lawrance mine turned to chese and fell apart bought a new one here in Australia and it cost me $68 aud about £32 pound i bought a radiator cap and chain guide for $ 86 these parts aren't cheap but the material they make the guides out of seem to break down with time hope this helps a second hand one may also just fall to peices like mine cheers
I have one I have been trying to get some pretty good minds with some pretty good printing equipment to copy. So far they cant really get it done in a material that doesn't break down straight away from the chain lube. So far its looking like machining it out of a block of the right stuff may be the only option difficult and expensive option. I'm working on itWould have thought a perfect candidate for stereolitho in the right material.