what lenth of bolt did you use?Faisal, this is so easy mate, just make sure you dont drill to far over!!!
i drilled 8mm hole, 8mm bolt with 2x washers and a nylock nut on top, it says on posts to lock off 1st with a nut , then put the arm on, then another nut, but trying this i found the angle of the cable to be too much so i just used one nut.
any probs give me a shout mate!
oh, and the difference is unbelivable! i will never go back to standard now.