The wire was an epic fail, not the right tolerance, so made up all the bits I could with pins and I discovered on the tray were loads of 'fallen out pins', damn microscopic. So how best to pick them up and insert into the track holes, well after trying tweezers and a few pinging off never to be seen again , I came to the bright idea of white glue and a scalpel. touch of glue on the end of the blade, dab a pin, turn it upright, insert into hole and push in with a dry blade, so far seems to have worked, but got loads to sort out and still need to glue some together, but will put them on the bottom run, so wont matter to much, reckon another few days and should be done. Argghhhhhhhhh