Just grind it you girl. you wont go through the rim. just do it lightly. unless your going to be a complete and utter tard like my mate and try putting a grind on his rim with a sanding disc
Finally, Been waiting for these yellows for while after riding rossy g's bike as hes still using his atm, Really good pads, Great bite and holdd, will be ordering some shortly
Clean your rim with white spirit if your running smooth rim, wwait for it to dry, then go ride you bike and see how the brake is, then apply a little tar and your laughing.