I just center the rudder and snug the wheel down with a bungee. I loop it around the pedestal and hook the spokes. Not so tight that it doesn't move at all. Just tight enough to let it wander a little bit.
When I need to steer (without removing the bungee), I can easily override it as the hooks slide up the spokes to the hub when I turn the wheel hard over. I find that no matter how sloppy the boat wakes might be when we're anchored, the rudder is always centered with just a slight amount of movement to ease the stress. The rudder never slams against the stops like it would if the wheel was untethered.
I think the lock makes it too rigid, which also might add to stressing the system, besides it simply isn't necessary.
BTW, I also deploy it when I'm sailing, or even motoring at lower speeds. When the rig is balanced, I find that I can leave the wheel alone and she'll stay on course. The only time it doesn't work well is when I motor at cruising speed ... my offset prop shaft overrides the strength of the bungee to hold the boat on course.
When I'm steering a normal course, it is deployed but doesn't affect my movements. When I let the wheel go, it will eventually wander off course, but normally, I can get enough time to leave the wheel for quick tasks, even making it to the head and back on occasion. Basically, I have my bungee restraint deployed about 95% of the time. I generally remove it only for docking maneuvers. So I have it fixed to the pedestal ready for use at all times. I find it simple and very effective. It relieves the need for autopilot to a great extent.
I will sometimes drift with the wind in a particular direction by positioning the rudder and deploying the restraint. The boat will actually sail along at drifting speed in a straight line. I'll point the boat in a specific direction downwind, but generally across the wind, let her drift and read a magazine as a cooling breeze keeps the cockpit comfortable. With the bungee restraint, I can make the boat drift in a very specific direction.