Hello, today wanted to change the front hardy disc with my Omega B (switch). To do this you have to solve six screws, 4 I got off and with the other two I now have the problem that these are almost round, moreover you can not use a ring key but only a fork key there. But the fork key has no real stop and the screw off is impossible. Is there still a way to solve this ?? I am with my Latin at the end.