The pinch bolt is the one that holds the ball joint in place. Have done the two bolts on the strut when i changed them and they weren't that bad....
Had the n/s wishbone all undone (with ball joint still attached as im replacing them too) it was just the pinch bolt left and as it slides out it hits the bottom caliper bolt head and that was it, as the caliper must have been tightened using an air gun on MAX setting!!!!
Booked in friday, its just annoying as I like to do it myself as i like to know its looked after and not just another Job no at a garage,although im mates with the guy whos doing it so its not that bad ..