Rocker Shafts- Washers?

I heard back from Angelucci today.

He makes them sized for standard rockers. He says the Crane's are a bit bigger, so he agrees they need to be sized. He runs Harland Sharp rockers and uses about .005 on each side of each rocker and spacer. He doesn't use Crane's, so he doesn't know what they're made of, which of course is aluminum. So yes, the .015 to .020 sounds good, if the Harland's are aluminum.

I actually already started doing them myself. I was thinking, it's only about .015, or .0075 off of each hold down. It's also not a critical dimension. So, I'm doing them with a belt sander, rotating them 90*, and mic'ing the 4 corners as I sand them, to keep them square. I have been able to keep them within .002 to .003 of square. (I used to work in a tool and die shop and sometimes things had to get done on the production line.)