You have four flanges, two shafts and the timed orientation of each spline to deal with. That's quite a number of reassembly possibilities.
My advice would be to take a die grinder, remove the existing weights, assemble them without worry, and take them to a drive shaft shop for proper balancing. Any drive shaft shop should be able to do this for you. You should order new felt seals for the sliding spline joint while your at it. Make sure you have a proper set of bolts and locking nuts. You dont want an instant replay. Afterward, do whatever cosmetic work you want and you'll be assured of only having to do the job once this way.
Best,
Kelly
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