Hi Zoltan

I wrote up a complete repair seems to be in the last five years;  just
search the archives under my kelphoto, should get you close  Pmail me
with any questions as I'm on digest..

The motor and mech are attached via a plastic and rubber coupling.  If
memory servers the couple is pretty tough, to get them apart I pry with
a couple of thin blades and  I spray a solvent, we use Moovit up here
but WD or some such penetrating oil, spray with the straw at the shafts
where they would exit the motor and or the mechanism. Wait , Pry ,
spray, repeat...  Wigging the two components  in a side to side motion
and/ or tapping on the actual couple may dislodge it a bit sooner, once
you get  the flanges apart enough.  The shafts are slip fit into the
couple about 3/8 inch.  So worse case if both end moved the exact amount
until letting go you'd be at the 3/4 inch part.  It seems that the
rubber part of the couple is cast around the two plastic collars , so
prying may feel like something is rather elastic.

Mark