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Propeller mounting (paper shim)?

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Dana

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I’m getting ready to mount the new wood prop I got from Ed Sterba for my Hatz. A question: On my T-Craft (Sensenich wood prop on an A-65), there were paper washers or shims on both sides of the prop hub, between the prop and flange, and between the prop and the crush plate. They were full circle, not partial shims to fix tracking. Any idea why, or is it necessary or advisable? I haven’t seen it done anywhere else, but I haven’t installed a wood prop on a “real” airplane engine since then.
 

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