I think I've found where the yellow wire is broken from, it is the neutral
from the mains and is twisted to a grey wire before being soldered to a tag.
Desoldering it then it become obvious that what looked like the end of the
grey wire is the remnant multistrands of the yellow.. I'm only in delayed
contact with the owner. I suspect this wire broke on me removing the motor,
the 1M over the mains seems to be the R of a mains RC filter. There is 10
wire ends to the stator, down to .1mm which marries up to the remnant on a
tag. A .4 mm wire is soldered internally , under the yellow tape to a
probably .15mm wire that then presumably carries on to a tag with a remnant
..15 mm wire on it. Someone's idea of a fuse ? I've looked on one side of
this .4mm soldered end, under x30 and can see no sign of a break, will try
turning it to view the other side. I suspect these 5 stator wires in
parallel/series give the hi/low + boost and 1 to 5 speed ranges and no triac
control. Elsewise joining .4 to .15mm wire makes no sense. I suspect the
owner lost the .1mm low speed range some time back and then sometime the
..15mm wire broke and then the neutral connection .
I would have expected to only see .1mm wire in a mains clock motor not a
torquey motor.
The motor at the rotor pole pieces, so about 18mm radius, requires about 100
gram to turn, Compared to drill motors this seems a bit tight. I've not
removed the nylon gears yet to check but a bit of turning resistance might
have led to an overload of motor current