MF, haven't noticed any different in the primer caps but I have gotten dodgey "O" rings from an ebay supplier so I get mine direct from China for a fraction of the cost, get probably 10 for the price I was paying for them here. I get the thicker ones and I have no problems with them. The aftermarket needles just don't work, obviously the genuine Victa ones did work, but now they are all coming from the one source and are all rubbish. Viton ones are the only one I can get to work.
