I am attempting to install my new kool stop dura II cartridge pads into my new Shimano 6800 brakes and am having a tough time. The pads don't simply slide in like they did when I had changed out the pads on my old 5700 brakes. As a sanity check I tried putting the stock Ultegra pads back in and they slid right in. I am attempting to put the pad marked R for "right" on the right side (driveline side) and the keeper screw is backed out plenty. The kool stops seem significantly beefier in the area that slides into the caliper. Am I missing something or has anyone else had this problem?

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"It never gets easier, you just go faster."
-Greg LeMond