Thanks guys.
I picked up a semi-complete tensioner. It has had the all-thread cut off. Nath, are you able to measure the total length of the threaded rod? Once I get that length I can grind off the remains of the old one and weld on a new bit. Also if you are able to do it (might need to be a contortionist!), can you measure the length and width of the plate at the rear that the bolts are welded to that come through the slot in the frame and then through the tensioner? Once I have that measurement I'll make one of those up too.
I'll have another go at this wheel using heat and a hammer. There was a specific puller for it, it is just NLA now.
