Interesting. Just tried mine and it does start, but gets stuck about a quarter of the way down. Had to beat it off with a rubber mallet. Measured..... the OEM holes for the studs are about 12mm. The big bore holes are right at 10mm.... 2mm less than the original cylinders. Since the studs are 10mm... what we have is almost an interference fit between the holes and studs. I think I'll drill mine out to 12mm. Didn't really expect any problems.... shoulda' known better huh?I also tried a second one and it is the same way. I am in trouble. I already sold four of these kits.