We had the opposite. When we prepped for the NAs, four years back, we found the step was not class legal. (Too far forward) When we pulled the rig, we discovered that we were all the way back, on the original holes, and that the boat had been that way since 1979. (Four clean holes, nice mark on the fiberglass, virgin fiberglass, with no hint of old holes) Took a week of soaking the screws and an impact driver to get those suckers to move. We re-filled, the holes with west, set the step where we wanted it, drilled new holes, and were set. I'd be very reluctant to enlarge the slots, you don't really want to be messing with a cast part.
- David