Hi lawson4, WOW, I see your problem. Did some searches for you, just nosey I guess, can't find a darned thing. Where I used to work had all this stuff, unfortunately they are out of business now. This was a faucet co. (Sterling) which was bought up by Kohler and moved all over the US in different places. I used to do QC there, among other things, and we set our own ring gages and had some state of the art measuring equip. there. If I can think of any way to get your info. I'll get back with you.