I would not push the inertia effects of the cam plate too far, certainly not to the point that the path of the selectors could be affected by wear in the slots.If we could change gear without the clutch in the heat of racing on a standard lightened camplate and 1275cc pushing through the box I suggest to look elsewhere for better changes (not that a belt drive and a Newby clutch did not help)Just thinking aloud here but if one wanted a very light cam plate how about an ali one made like Neville's modified one, hard anodized and then use a replacement for the G35 centralising plunger which would have a rotating roller in it's end rather than a hardened point. I do not know what would happen to the wear between the slots in such a cam plate and the 'pegs' in the two G29AS and G28s forks but hard anodizing has been used on some cylinder liners where there is lots of sliding wear with piston rings.