^
if you ride around dirt or moisture i wouldnt recommend that. the o ring and the other rubber seal are there for a reason. i grease literally everything that is inside the headset, yes even the underside of the topcap, so maybe it would be differnt if you ran dry bearings, but i wouldnt recommend that either
but then again, im kinda like a do it once, do it right, so i dont ever have to touch it again. lol
just my 2 cents