Hello, I am looking for some replacement o-rings for the ce4s. I see them listed everywhere for the 510s, but I want those little white ones for the ce4 drip tips. I keep losing them and now I'm down to only one. I know I can buy o-rings at hardware stores or whatever, but these ones seem very small, almost like the rubberbands people use for braces or whatever. Or if anyone knows they sell them at the store, what size? I'll probably go down to the local hardware store and see if I can find any, but I'd prefer them to be the right size and silicone, not some other material that might not be resistant to some liquids.