Like any switch installation the base they are mounted on is the solution to many problems. Level and straight is the answer. The only problem I have had is with my post-war cars with an electrical pick up shoe. Early on I tore several of them off before I fabricated a small plastic ramp to help lift the shoe before it hit a high spot. Other than that problem I have had no problems. O let me modify that with the fact that my per-war engine has larger flanges and does bump when navigating the switch. All my switches are O-42.
Bud