Seeking MK3 backfire device adjustment help

After doing all the upgrades to re-fit the starter assembly for my 71 yo knee all worked great for a few rides but now the backfire device just spins even with the spark plugs out. Read all the old postings here on the unit and tool needed setting these up feels beyond my mechanical aptitude. Old Britts has retired and CNW does not mess with these. New from Andover Norton will end up being @$400 or so for a complete assembly. Any shops or individuals experienced with these out there willing to check mine and adjust? Or willing to loan the home-made tool needed? I'm in California.

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Why worry?? Sent the AB unit to Fred Eaton to adjust.
$65 plus shipping each way

L.A.B. said:

Old Britts, Overload backfire device assembly and adjustment

Click to expand...

Thanks, have seen that but not with the pictures.

I set mine with a socket and some lengths of welding rod instead of making a tool.

Where in California are you? PM me.

71 ? Yo knee ? Oh , you are 71 and the knee you are worried about hurtin' . ?
Mine has never engaged or slipped . If it did I would give it to Geoff Doherty in P.E.C. , Ontario .
I never kick the MK 3 .