How to adjust reticle clarity on Wien K. Kahles h/4x60 scope ?

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hello, can anyone tell me how to adjust clarity on a vintage Wien K. Kahles h/4x60 scope ? I see the knurled knob half way between eyepiece and elevation adjustment, on scope tube, but I can't turn it. This has a flat blade set screw in it. It appears to be the adustment ring for the reticle clarity, but it's seized. Are these known to seize up with time ? The elevation knob is free and works just fine.

It appears this ring is held into a slot that is angled from left to right, so when the ring is turned, it adjusts the clarity of the reticle for your eyes. I can see the reticle perfectly clear without my eyeglasses on (I'm nearsighted and wear glasses) but when I put my eyeglasses on, the reticle becomes blurry. Usually I'm able to just adjust the ocular eyepiece until the reticle is clear with my glasses on, with every other scope I have on every rifle, but on this scope it is nonadjustable, just screws in and holds the lenses in place.

any help appreciated

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