Thanks to Andy Reynolds for vids. 

Investigations into damage and engine noises.

Faulty main bearing replacement

Replacing the main bearings in the crank cases and preparing to refit the crank and cases

Fitting subframe and piston

Refitting the cylinder to the rebuilt crank case

Replacing the flywheel, ignition coil & exhaust

Replacing the oil pump and drive; then the chain brake and clutch

Fitting the clutch, and advice on maintenance & repairs

Refitting the top handle, recoil starter, carb, and throttle linkage

Refitting covers, setting standard carb settings, fuel and oil, priming carb, starting the saw