the blocks are dammaged because you let ridges form over the contact area, reducing braking power. Don't bother repairing them this time when new pads only cost £3-£4 a pair (wilkinsons have them for £1.99) but look after them better next time. It could be the result of dirty rim and not poor alignment.Really? I was adjusting them with my allen key and even when perfectly aligned they hardly gripped... am I doing something wrong?