If you run a Spitfire, it isn't all that rare. As a matter of fact, the
production Spit I have stashed away in one of my storage units was sidelined
due to a sheared flywheel. And a few years ago, out at a divisional autocross
some friends with a newly built Spit had it happen to them. Turns out that
the flywheel was bolted on with exactly zero pins in place. Luckily I had
my portable compressor and a range of air tools so we could slice and dice
some bolts to make a pin to get them back on the course for a couple of
runs each the next day.
When I finally get the proper flywheel, or figure out what clutch cover
fits the one I have, I'll likely add an extra pin or two to Killer's crank
to hold the flywheel on. Hmmm, better order in some new bolts, too.
mjb.
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