... to be plane with the sides of the rail. Why not curve them to allow the rail to rotate in the horizontal plane while it's still constrained in the vertical plane? That would give the chairs a fair bit of horizontal "wiggle room" without compromising the vertical constraint. It would not eliminate the need for angled jaws entirely, but it might significantly reduce the number of jaw angle variants required. Am I on a snipe hunt? posted: 6 Jul 2018 23:24 from: Andrew Barrowman It might work. 2983_061810_020000000.gif The blue line is the nominal angle, in this case 4 degrees. The coral and green lines are offset one degree (3 and 5 degrees). The radius of the curve on the jaws is 29 mm (red lines). I'll take a shot at replicating this on my printer and if that works I'll put a model on Shapeways. posted: 7 Jul 2018 19:42 from: Rob Manchester Hi Andy, When building P&C work using Exactoscale chairs I sometimes use chairs that are not strictly ...