Had the same issue on my 588, with same heads, intakes rockers also.Sent rockers back to Jessel, talked to Joe in rebuilders shop. There are 2 bearings inside of the intake rocker versus one on the exhaust. They can move the bearings around inside of the rocker body to position the rocker correctly. BTW there are spacers there and I did use them to fine tune the positioning of the tip. I race my motor and have been checking them weekly for any wear, so far so good. Jim