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Old 09-18-2008
GBurton GBurton is offline
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You will have to shorten the shaft if you push it back to install the coupling and the prop hits the rudder.
If your engine is not correctly aligned now then the coupling will not help much. The tolerance that a flex coupling will take is .010" or so but it will still be noisy. Best to align as perfect as possible then install flex coupling.

The straps are not ground straps but failsafe straps - so that if the coupling disintegrates you will still have propulsion.

The main purpose is to prevent shock loads from transferring to the gearbox...not to correct misalignment
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