What Young Bucks said was SOP back in the day, when all scopes used a slide tension adjustment for elevation and windage knobs.
Early Leo Vari X II's was the last of the Leo scopes I think that used this system, except it can still be found nowdays on Leo Rifleman scopes last time I looked at one long time ago when they 1st came out.
FWIW the slide tension system worked OK - just not as good as the more current positive click system - just gotta be aware of it and respond as needed. I kept a long handled screw driver in my kit with a wooden handle, instead of a plastic one, so as not to dent the adjustment turret thin aluminum dust caps.
"These are the times that try men's soul's"...Thomas Paine
"Those who fail to learn from History are doomed to repeat it" ....Santayana
"There's a sucker born every minute" P.T. Barnum, on why he always had customers to see the sideshow features.