slo-syn motor frustration, can someone help?

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Original poster: "Robert Hanford" <pomnept@xxxxxxxxxxx>

Hi All
I recently bought a great old 220v variac and it came with a slo-sync 
motor to move the wiper. It was working nicely until one day it
(the motor) started just sort of trembling. I changed the 3u cap with 
no luck and feeling that a winding was probably burnt out I found one 
that is similar in all respects on e-bay, except that it is about 
twice as long! It sort of works with a stuttering shuffling action 
and I am thinking and hoping that maybe with a different cap/resistor 
set up it might work.However being the incompetent person I am I was 
hoping for some feedback on this before I do anything stupid! Replies 
much appreciated.
Robert Hanford