Johnathan,
It sounds as if your front bulkhead is the old style which is not adjustabl
e. That is OK. The best way to make a permanent fix is to clean the insid
e of the spinner, apply a thin layer of oil or release agent to the spinner
, then apply RTV around the cap bulkhead. Push on the spinner and bolt it
down and it will make contact and seal up that gap. Remove after cure and
trim for a neat finish. Keep in mind that automotive RTV or silicone seala
nt against aluminum will corrode the aluminum during cure as most contain c
itrus acid (i.e. that acid taste) so you may consider using a non-acidic or
neutral cure type RTV such as Dow737.
Another way which I have never done, is to apply silicone sealant to the mo
tor cap, so the bulkhead is proud of the end cap and push the spinner on an
d bolt down. I have never done this as the plastic bulkhead still rubs dir
ectly on the aluminum causing eventual wear as seen as aluminum dust. RTV
is softer and less abrasive under vibration.
Bottom line is if the gap is too large, the spinner screws will eventually
wear and that is a fatigue source for an eventual crack in any spinner.
Best Regards,
Bud Yerly
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