Its only a soft spring as long as its springing back thats fine.

So the contacts aren't pitted or burn't or anything then? My Orion broke down just short of a year ago and it was the brush stuck in the cap, but after i free'd it off it kept playing up anyway cos the contacts were all so badly pitted and stuff.

Bought a new cap and arm and its been mint ever since, AND it had always had a really annoying intermittent mis-fire which also turned out to be that.