Well my gearboxes arrived and using the mysterious instructions about black cats and hexes

I proceeded to remove the old and on with the new. Suitably reassembled and with battery refitted I tried it and....... IT WORKED!!!!!

It zooms around and spins, turn left and right, turret up and down and left and right. Didn't try firing bb as the dog was observing with either interest or horror, couldn't work out which, and I didn't want to spook him. Well I have a working Tiger 1 first tank and all for £35 including postage plus £14 for the gearbox incl postage - amazing (just have a spare RX18 that I didn't need but hey maybe I'll need that for the next tank - don't anyone tell the better half).
One small problem which I feel requires fine tuning. Right tread works perfectly but the left tread is clicking at the rear idler. It seems to be catching on the idler wheel somehow before slipping on. It doesn't seem to be affecting the handling but I would like to fix it. Any suggestions please?
I'm going to look out for a sherman in February that is in need of tlc so if anyone hears of one let me know.
Happy new tank driver
Alwyn