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I can't say I have any experience with the cracking spinner parts you all
are having but .......

Years ago Piper had an awful problem with the spinner back plates of their
Piper Warrior aircraft which use a Lycoming O-320 engine. They came up with
several designs but all seemed to crack.

I had a customer who had a cracked back plate. I got a new spinner
back-plate removed the doubler (riveted in place with a couple of -3
rivets) and bonded the doubler in place with Dexter-Hysol number EA9394NA
and reinstalled the rivets. EA9394NA is rather expensive and is used as a
liquid shim on fighter jet wing fittings.

On significant caution ............ be very CAREFUL with whatever is
between the crankshaft flange and the mounting bolt heads. If the material
is prone to cold flow (kinda ooze out as it were) the torque of the
mounting bolts may be lost and it would not be difficult to imagine you to
be prop-less in flight !

The Warrior ?  My fix worked fine. So far it hasn't cracked and that was
many hundreds of hours ago.

Good Luck.

Ted Stanley A&P-IA

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Please send your photos and drawings to marvkaye@olsusa.com.