I was wonder what the sizes of the post screws and o ring sizes are for the more popular rta/rda s. I have looked and everything is all over the place. Maybe we could do a post that everyone could post the sizes and maybe a link to order them online. Plus we would find out the common sizes that most companies use. I know that I have a few I would like to replace and I have lost a few and I like to have spares around.