Yes, several of the large calipers are like that. Friction wheel with fine screw adjustment. With this particular one, the adjustment screw threaded hole needs a tap clean out. Once the soaking thread gauges free up, I'll size it and find a matching tap. This will be fun to tap, the little ball would need to come off to disassemble it but it looks peened over and refused to move by hand. I fear scaring up the ball to get to unscrew it.