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We had two backing plates crack on an O-320, fixed pitch
prop, with the Lancair 12" spinner. The slight out-of-balance of these spinners,
with no forward bulkhead, would cause them to flex the backing plate and crack
it. Since putting in a fibreglass-reinforced 1/4" foam forward bulkhead
inside the spinner, which fits snuggly around the crush plate, there has been no
more cracking on that plane, nor on my O-235.
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