QUOTE I wanted to keep some old stock that I had from long ago but since they mostly have plastic wheels which I plan to ban from my layout they will need to be re-whelled
I know what you mean. I still have some Triang / Hornby wagons from the original train set days and I don't want to part with them. Strangely they are not too much of a problem apart from a slight tendency to jump off going through point crossings now and again. The real "no no"s are Lima coaches from the late 70s and 80s which run along the sleepers and sound like it too. I am slowly building up a collection of Bachmann Mk1s as replacements.
I've managed to find the 3 way point wiring diagram and have uploaded it to my UK Modelling gallery. It is:
There is legend attached in the gallery view which you can get to via this link
<Edit> I found the crossing diagram as well and have uploaded it also
I find that drawing point sections in paint brush is a very good way to work out where the power goes. All you need to do is draw out the point sections, and then use the fill tool to change the colour. Provided you have drawn the sections correctly, you should not find the rails going the same colour. When drawing you just have to remember that pixels must touch along a side. Diagonals (pixels touching on a corner only) will not fill.