I bought a few Kayfun v4 clones, and been having leaking problems because some of the o-rings aren't the correct thickness. Rather than spend $13+ on the kit which contains parts I don't need, I bought just the correct o-rings. However, I had to purchase A LOT of them. What I am thinking of doing, is making replacement sets of just the rings, and selling them for $5 each to recoup some of the cost. Would anyone be interested in purchasing?