What is this tool thread?

halifaxhops said

Thickness guage?

Click to expand...

Honestly I'm stumped myself. It definitely measures something because as you turn the knob the pointer moves, but my thought is why is there so much tool if the measurement is in that one spot?

halifaxhops said

Here

View attachment 1716057409

Click to expand...

Also looks like a harmonic balancer puller?