Wondering if anyone knows what the thread type is on the bottom of the Coleman air stem part is that screws into the Check valve? There is (generally) a thinner one and a thicker one evidenced by the two rods supplied with extraction tools. I am specifically interested in the one that is 1/4" and 32 tpi (I think that is what it is). I am getting one machined up and the tool maker has indicated it is unusual and do I know what the thread type is, e.g., BSF, BSW, UNC, BSB etc?
