Caliper jaw extensions

I had to measure the middle of a rather large cylinder, so I made these long jaws.
The extensions slide on with a snug fit, and they shouldn't wobble at all. Close the jaws, "zero" them out, and have fun.

On my caliper, I found one jaw to be a 15 degree wedge, but the other (movable) was 16 degrees. So I made mine accordingly. That's why there are two distinct jaw files.

I guess that angle is somewhat variable, depending on how much meat they need to grind away to make a set of jaws perfe