Hope pro evo 2 conversion 142mm caps - need O rings? My kit with the two caps did not come with O rings. I see that the QR's I'm replacing DO have O rings but the channel they are in appears to be deeper than the channels in the 142mm caps. I can't get the O ring from the QR caps to fit the channel in the 142mm cap. Is the O ring needed here when I pop in the 142mm caps? Is that why O rings were not included?