<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>Hi All,</DIV><DIV> Starting in on thru hull production. I will need probably close to a dozen of them. I'm making them all to accept a 1/2" stainless shaft, and I will be using 1/16" O rings. I don't see any need to use thicker diameter O rings , since the deeper O ring grooves can be a bit more problematic. By the time my welder finishes all the remaining critical welds I should have my thru hulls done. Also working on my forward hard ballast tank, approx. 18" in dia X 5' long .</DIV><DIV> </DIV><DIV> </DIV><DIV>Cheers,</DIV><DIV> </DIV><DIV>Brian </DIV><DIV> </DIV><DIV> </DIV></DIV>