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Old 07-06-2017, 09:37 PM   #4
Alabama Boater
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City: Athens, AL
Country: USA
Vessel Name: Always Something!
Vessel Model: Tiara 3700 open
Join Date: Apr 2016
Posts: 103
You should not need a spacer unless the length of the hub is shorter on the 1:12 props. The front of the hub @ 2.25" diameter would be in the same position as your current prop but if the hub is shorter the rear would be forward by the difference in hub length. If the set up is done correctly, the large end of the 2.25" bore has no material removed. That large diameter is used to center the boring setup. It should be able to center at 0.0005" total run out. I have heard of some shops using a taper reamer but I am not familiar with the set up used.
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