Without seeing it, this fault Sounds mechanical rather then electrical to me....

Hi Dean,

I have changed the coil sleeve and checked the brackets, checked the spring to make sure it wasn’t catching on something , loosened ad re-done the nuts holding it the coil to the bracket in case it was out of ‘square’ and after all that it moves VERY freely when moving by hand, there is little to no effort required to move it back and forth.

I don’t think there is anything more mechanical to it?