... which doesn't work so well for detail. Even so I needed to beef up the design of the chair jaws to give them sufficient strength, as Andy warned me I would. At present the rail fit is a bit too tight, and I managed to thread only 4 of the 6 on the test piece without breaking them: 2_291620_530000001.jpg 2_291620_530000000.jpg 2_291620_530000002.jpg Above are EM gauge, with C&L code75 rail. I think I have maybe over-beefed the outer jaw, there is still a lot of experimenting to do: 2_291641_260000000.png cheers, Martin. posted: 30 Dec 2018 00:53 from: madscientist Have you considered PETG, it's strong but has some flexibility, or perhaps FPE, of which I have no experience but the specs look good Dave Last edited on 30 Dec 2018 01:13 by madscientist posted: 30 Dec 2018 01:38 from: Martin Wynne madscientist wrote: Have you considered PETG, it's strong but has some flexibility, or perhaps FPE, of which I have no experience but the specs look good Hi Dave, ...