might some of them be familiar to me??I machine lots of legs. I make new legs for TS86’s and take the bend out of 59 legs.
First of all you need to find the flat face of the leg. Clamp it down on that face and then machine the other face square and parallel to it. Machine the mating faces at the top of the leg as you go. Take off as little as possible.
next comes the fancy bit. You need to machine the frog mating face so that the point is tipped in towards work and the heel of the landside is tipped out to land. It needs to be done in such a way that the frog is vertical when bolted on. That’s what the horseshoe Mark is in the middle of the leg. At this point and on the leading edge of the leg it should be about 1.5mm deep. ideally the mark should have surfaced before it reaches the back of the leg. Done properly then about 6mm should have been taken off the face of the leg at the front leading edge.View attachment 909525