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I thought it looked that the shoulder with the key groove was intact. And the reference to removing the "nut" made me think is it's an old style cam.
I've had it happen to me. The threads are serious stress risers so the weak spot is there
as a rule.
__________________
Mark
www.exotechpower.com
1981 Targa-messed with. 91 C2 supercharged track rat
Radical Prosport-irritates the GT3 guys
40 years of rebuilding services
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