ErikSS wrote:JamesDowning wrote:It's the same measurement you made, by butting the tape measure up to the top of the threads. The locking collar just gives an easier thing to grab if you can move it.
Kind of. Youre going to the bottom of both collars, and I was measuring the top of both collars.
Maybe it wasn't clear what I was measuring exactly. I was not going to the bottom (although, that's hard to be clear on, since my picture is upside down). I have the hook of the tape measure grabbing on the mounted-top side of the locking collar, when spun all the way up.
ErikSS wrote:This is how I'm measuring.

So, I'd read your measurement at 4-3/8".
Mine I'd read at 3.5".

Using that method, it shouldn't matter if you're measuring yours by running the locking collar up to the top and pulling tape from it, or jamming the tape end into the shoulder at the top of the threads.