Hi Martin and Howard
Just a brief clarification.
I hate the look of overscale joggled points and haven't made any before.
I've made undercut "proper" (as I would affirm) turnouts successfully. Yes using fine sandpaper though not I confess with a swiped butterknife. (My chaotic household of artists doesn't rise to such niceties though no one would notice or mind if I did take one - if it existed!)
The blades took me longer than the rest of the turnout each time to get really 100% reliability with my own stock. But I think worth it in terms of prototypical appearance. But if a not very well suspended vehicle, or worse one without any suspension at all, derails on an undercut turnout of mine, the suspicion might be that the wheel flange is riding up the blade as the latter rises to the rail level. Anyway, my brief is to make some joggled switches , not for one of my undercut types, but for another already joggled turnout that is suspect. So this is a learning exercise for me and I am interested in how to do it with the maximum realism. Which means minimising the amount of joggle, but if I insist on a joggle that for reasons of practicality is more than prototypical, how best to disguise it. I have omitted to say this is for a colliery line, probably NCB.
I take your point haha Howard but have to say the joggles on the layout this is intended for do not give any trouble in the trailing direction.
I realize I must use my own skill and judgement to answer what is a stupid question and that, yes, I did know Templot won't actually make the point for me
...even if I knew how to work Templot!
Given that a REA 3/8" (0.125mm) blade has a 6" (2mm) return length joggle, a 0.2mm blade would by the same proportion have a 9.6" return length joggle: so if I manage to hit something near 3mm that will be quite accurate enough for me.
If I have any more banal questions maybe I'll transfer all this conversation to a new thread with a heading as I have put here