Drill a hole in the outer piece and then make a small plug weld. Just like body panels.
Does the OD at the base of your polylocks match the recess in your rocker arm? They are usually .550 or .600 inch.
Will have to see what I can work out with John and his TIG welder.
Didn't measure the OD of the locks, but they came with the girdle as one part number.
It's been a pretty expensive winter, so I plan on staying with the baffles that I have now. They can
always be replaced later.