BBBB has a point, the S-Rex springs are a bit wider in both dimensions so won't fit. You could plane them down I guess but could be a bit dogey if you hit the spring
My legs hurt like hell in the places, where in contact with the knee loops. Suppose I have to adjust the height of the loop a bit higher and get some better knee/chin pads.
u are going in to ur roundoff a bit strange u need to go straight on and jump in to it and block with your feet and throw your arms up and tuck and you are sorted