Changing the top magnetron on an assembled engine is bloody hard. It takes a long hemostat or nut starter and patience. Put your shim against the flywheel magnet before you drop the magnetron in. The magnetron has slotted holes for the attach screws, but mine were bottoming out with the shim in place. Also changed the wire canopy limiter to Paracord to back up the gas strut. The wire had no give and it had the wrong swage fittings. Still working on the remote fuel shutoff. Finished one tie down fitting, but could not find the other eye bolt, ordered some more. Sealed a gap between the canopy and the turtle deck