I had a situation on my old 4/4 when I first installed the SSL kit whereby even though I could see a gap above the rebound spring, I could not rotate it.
The rebound spring was so tight in the bottom crosshead lug that it wouldn't rotate with just "finger power"
Eventually I freed it with Mole grips and gradually loosened it off to the point where I could rotate it if I used a rubber glove for grip.
Even now, If it won't rotate when I think it should, I double check to see if it is sticking in the crosshead lug.
