I know exactly what the OP was "trying" to say. I have been there before. Sometimes people get locks and retainers confused as the OP did in this case.
You cannot set the lash using a feeler gauge with a solid lifter camshaft if you have self aligning rockers. The gauge will not fit between the rocker and the valve tip.
Self aligning rockers are difficult to use with Comp Cams 875 or 15850 short travel hydraulic lifters. Those lifters set a .005" pre-load. I am using CC 15850 lifters and can set them with a "flick of the wrist" without a feeler gauge which is 1/16" to 1/8" pre-load.