CrooksUSA had a 5 year old Nikon Prostaff 3-9 X 40 rifle scope without the thumb-adjustable turret knobs….. This is not fire-tested, but works well on the bench. Probably will be better than using a nickle to adjust windage / elevation, as you wont have to move your eye from the scope.
Note: Crooks made this to fit some springs he already had. Next time he take them off, he will measure them so that you can locate the correct spring…… Or possibly redesign this for readily available springs.