Luke's got my rail and body for the pump milling at the moment, so I can't check. 3/32" might be right. I picked up the 3/16" at my local Rural King and they had a 1/8" rod as well that looked more like the correct size in hindsight. It was kind of bent slightly in a couple places, so I was wary of getting it, but it was the last one they had too. I'm sure if it's the right size I could make it work though.