[PJL]

Not much hope of unwinding this to count the turns as the bitumen has soaked into the winding in places. In any case, there is no real former, just a bit of paxolin at the centre that does not even extend over the full width of the winding as it's mostly held together with layering tape. Best bet is to start again with a homemade former from some very thin paxolin sheet I have and some araldite. I know the turns ratio is 1:3 so if I fill my new former to a quarter depth then I know how many turns for the secondary.

I will clean up the laminations and other bit with white spirit.

Ed: Got distracted and didn't press the save button till after your post...I have done a few 6000 turn windings recently! I will measure the resistance of a metre of the wire, I have lots of 3ohms/metre and slightly less 6ohms/metre.