My first post..
I recently purchased a Savage 99EG (5184XX)1948 vintage rifle. I also purchased a Marbles S1 Flexible Peep sight from E-Bay.

My problem is that the knurled knob won't turn so that I can adjust the height of the peep stem. The knob is locked tight..

Am I correct in assuming this knurled knob is designed to turn?

I have read the last 100 posts and really enjoyed learning about my Savage 99.