Sorry about the delay in replying.
Yes, Joe, I did get the pulley off.
The previous owner seems to have put paint on the thread, which didn't help.
Electradaz, it is the type you described but there was no room to get a spanner in between the pulley and cowling. (approx 2mm)
I ended up making a special tool using the rope notch as an anchoring aid.
It's all back together now and running like new.
Thanks for all your help.
