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Reply to "Hey Lane"

Curtiss used a single u-joint that is 5/8" 16 spline.  The splines don't match but it seems to work for him.  His u-joint is the type that is split on one side and clamps on and he probably had to open it up a bit to fit on the 16 mm shaft.

My 5/8" double u-joint is not split and wouldn't fit over the 16 mm shaft until I drilled the splines out.

I used the same thing on the end of the steering column shaft as he did.

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