... they only really contact three points on the rail. They are not even remotely like the prototype. I'll post the profile later (I'm still in bed drinking my coffee!) Cheers Andy posted: 12 May 2020 20:07 from: Martin Wynne Andrew Barrowman wrote: So that's how the angles work Hi Andy, Tightening the fishbolts wedges the fishplate between the fishing angles, putting the rail web in tension. Ideally sufficient to ensure that it doesn't become unloaded under the traffic load. Otherwise the bolts would work loose. 2_121622_580000000.png cheers, Martin. posted: 12 May 2020 20:59 from: Andrew Barrowman...and here's the jaws profile I'm using for SMP rail. The slicer will chamfer the lower edge of the inside jaw somewhat. The gap for the web is drawn oversize but it works for SMP rail. The gap under the inside jaw is to make it slightly compliant so that the rail is always forced against the outer jaw. All highly empirical of course but it seems to work reasonably well. A lot of other ...