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Might be worth tagging Greg on this one, he's a bit of an istick expert
I've not had the 510 itself apart but there's very little room to install a new oring insitu. Id think you'd have to take it apart, partially at least and that would likely end up a bigger job given the way the 20w iStick 510 is held together with rubber and mastic !
im hardly an expert, I am good a buggering them up though
A couple of layers of shrink wrap and an O ring was the best 'bodge' I could come up with for the sinking 510. I think the 30W is the far superior mod for the money and according to the specs will fire the latest lower ohm tanks that the 20W wont.
Thanks for the replies, had a quick search through the vape box and came across these which I bought last year for another job. So I gently prised the centre pin up and out cut off the old grommet and slid a new one over the top. good as new.
I Also have a couple of the 30w versions as well but apart from the grommet issue the 20 watt versions were still working fine so seemed a shame to scrap them.