After struggling with the puller (I've never used one before), I think I might have moved the pulley about a quarter of an inch - but I'm not sure.
Looking at the centre, it looks as if it's moved.
I attach a pic and hope someone can confirm either that it's moved a little or it hasn't.
Pulley bitmap small.bmp 1.92MB 18 downloads
The snag is that I had no more thread available on the puller bolt by the time it had moved that far so (if it has moved) I'll have to see if I can adjust the legs to give me a bit more thread.
This is a real bugger of a job!