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  1. Ok, heres my thoughts.... the left hand diagram shows an approach using two 10x18x5.5 thurst bearings and a miniature 10x15x4 bearing. the top bearing cap screws on to contol endfloat. The right hand version shows the same idea using two 10x26x8 deep groove bearings to give both axial and radial support.

    In both cases there is a central piece that acts as a shaft extender that goes over the existing shaft and is locked to it using a grubscrew or two. The only issue with this design is cutting the threads which are 25 x 1.5 (LH diag) or 27 x 1.5 (RH diag) for the end cap. I don't have a way to do that right now and the tap and die is £50!

    Comments?
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