273 318 340 360 Adjustable Rocker Arms w/ Moroso Chrome Valve Covers

I have 13 273's at this moment from 1964 thru 1967 and have no lock nuts on any of them. I can't even begin to know how many we adjusted at the all mopar only shop in the late 70's early 80's and I have never seen original an one with lock nuts...but I certainly have not seen them all. It's a great idea though provided as above resurfaced flat for best results.