I made one of these which helps move the insolator with the wheel
Get one of these. I think it is a 4 inch clamp from Ace or True value hardware.
The clamp has to be long enough for the wheels to fit between the threaded shaft and the notch.
Make sure there is a hole in the piece at the end of the treaded piced
Then Notch the end like this. I did it with a cutter on a Dremel Tool Note the hole in the piece on the end of the threaded shaft.
This is how you bring the wheels closer together
This is how you move them apart.
Move the side with the insolator bushing.
it moves the easiest