Thanks for the info Syph, I read your alox thread and it certainly spurred me on to do a few mods.
I will pick up a few bits. Looks like either 39 or 38 wire size would be close to the 2.5mm brass rod. I do not have a pin gauge set handy, how much slack should I leave? It does seem like the tools are not drilled to the same size as the scales and liners, they do seem looser to me.