Anyone using a ring lapping kit?
You could go that route, as a lapping kit will correct for any bias encountered while tightening the rings down. If you want an economy method, get a 10" section of 1" diameter steel rod stock. Metal suppliers sell by the inch/foot, and shipping will cost about as much as the rod.
You simply mount the bar in the rings, and snug the ring screws. Place the rings in the bases, and alternately tighten the ring screws and the screws holding the rings to the bases. I worked with a gunsmith many years, (decades), ago, that used the technique on the Leupold and Redfield bases and rings that twisted into the base.
Usually, with a quality set of rings, steel, the effort is not needed.
You can also pick up a torque tool that measures in inch/lbs, if you have a tendency to over-tighten things. I use a small screw driver with interchangeable bits, it limits the amount of force I can apply. By alternating between the screws, (like mounting a tire), you simply tighten each screw until there's no more "slack". You don't need to strain any muscles to keep a scope from moving, and the average guy can damage the scope by using too much force. More isn't always better.