I wanted to remove the Argo Navis AZ Timing pulley so I can investigate and find a soultion to my AZ stictation problem..

But.... this feels so silly saying it, but I cant remove the timing pulley..

Ive taken the washer and bolt of the top, and my assumption is to then scew the timing pulley off the bolt? But It doesnt nudge when i try and screw it off, Unless im ment to use a reasonable amount of force?..

Gary,anyone please...

Pics attached..