Ok, first things first lets get in side.
Remove the four large screws towards the rear of Percy and the cab will lift off.
If you remove all eight screws then his boiler will come off as well! but if you need to drill for smoke see below it prevents plastic swarf in the eye gears.
Gently pull his face and maybe slightly squeeze the sides to allow access to the base of his funnel if you require a smoke unit. Now drill a 10mm hole all the way through to allow the smoke unit to fit. I used a massoth 19v version.
Wire up you chip..... Massoth M was used for this one.
Conduct then programing and test before tidying up the wires.
Rebuild him the reverse of dissasembly
Put him into action.
Total time about an hour
