Unfortunately not but I have an 'N' shell and gears in my Commando with 39k miles of my abuse on them. Worn 1st and 4th sets replaced along with 2nd lay which was starting to drop out of 3rd. I can't find the reference but I recall reading that the early pre Commando housings used a better aluminum. However, that could well be old wives gossip. What I do know is that the current housing is in very good shape, no inter bearing cracks (just stripped and renewed quad and selector bushes). I also have a similar spare in as good condition.I plan to use the N#### gearset in a Commando. I may use the N#### shell as well. I keep hearing the gears and the shell are too weak. Can somebody please point me to where these weaknesses are documented, and when or how they were rectified? As far as I can find out, the early gears and shell are no weaker than those used in the first couple of years of Commandos.
Stephen Hill said:Norton boxes stamped N#### were built from 1957 - 1962.
Norton boxes stamped NA#### were built from 1963 - 1968.