Problem with Harland Sharp rockers

That problem happens with more than just HS rockers. I've had to modify some higher dollar stuff than that, T&D, and some cheaper, Cranes, because of spring/retainer interference. It's hit and miss and really depends on a lot of factors whether any grinding is required.

I tend to run beehive springs now and the issue is pretty much resolved. Get to leave rockers the way they were engineered and have a slightly lighter spring/retainer set up.