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Klaus!
Sorry it took me so long to find this - I had to go through about 40 pages in the gallery
to find this pic because the search function will only allow selection of ONE variable
and sets the others to default values. This was NOT one of the last 20 I posted!
Anyway below is the way the driveshaft needs to be assembled to maintain constant
rotational velocity. Even if you don't feel vibrations it is rough on a lot of things if
it is not aligned properly.

Note that the yokes on each section of the shaft are aligned exactly.
Worst case is 90° apart, which doubles the rotational velocity variation.
--
George Downs, Bartlesville, Heart of the USA!
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