No easy feat. They prob use a bearing made at an odd size just for Stihl. Otherwise you could use a shop press and install a new one and true the crank up.if they would give up the cylinder it is still usable.....exhaust port and one transfer is nicked up but it would still be useable. just throw away the second ring and reinstall the piston....
Now how do we go about rigging the big end rod bearing?