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Time for another speed bump. The M104C takes a mast size of 2" OD. That's a good fit for the Yaesu rotor and thrust bearing I have. The M104 is being mounted horizontally and the M58 will be just above it without the ground plane radials. The V58 takes a 1.25" mast so I need to be able to reduce the 2" aluminum mast extending just past the M104C into the 1.25" mast I have in the V58 now (I will be shortening the V58 mast to a foot or two long). I am reasonably sure I have enough various bits and pieces tucked away in my workshop or shed to come up with something.