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Tapers must match. The 1:12 can be rebored to 1:16 as the small end is less diameter than what your shafts are. The key way will need to be broached to the 1:16 taper. You would need to find a good machine shop that has the proper equipment and fixtures. Cost in USA to do rebore would be in $250 or more each. Things can go wrong when machining, so for me, must start out at very good price.
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