Have taken power head off but I noticed a couple of loose parts laying on base. The parts were two cresent shaped thin parts with a small spring. It looks like the parts are mounted on or near the cresent shaped cam on the throttle and shift linkage. This is my first shot at rebuilding my Merc Mark 28A. I usually can put things back together when I take them apart but these parts were not hooked up to anything! I have the service manual but it not only doew hot have a picture of the link assm but does not have any cutaways to look at. Someone have some ideas or photos of the linkage.