never seen any of mine do that mate, that ring is properly a retainer or something when they are made

when fitting a new camshaft, always replace the followers, along with new oil

but the other way round isnt as bad, but a worn cam can soon knock out the new followers

if u can afford it, buy a camkit, you get everything in the kit, and do everything all together, stems,springs, followers etc, rs turbos/cvh's cams tend to wear after 60k and are normally replaceded then