So I did a valve adjustment last weekend on my 95 R100RT and noticed that one of my rocker arms had some vertical play. If I remember right this is probably what is causing that head to be noisy and could potentially trash the rocker arms or worse if the needle bearings come apart...anyone have any experience with this? How long can I ignore it? There were 2 shims already in place (part 11 below). Do you add shims or try to keep the number of shims low?