An article in
SC Vol. 30, No. 9 (p. 36) addressed a problem of broken door glass. Cause allegedly a loose run channel, with advice to check for alignment of the runs, inspect for broken welds at end of "runway retainer", and - if needed - secure said retainer to door bracket with a "Parker-Kalon" screw.
Parker-Kalon is a company that, today, makes a variety of specialty screws, but it's also the registered trade name for the what's become the garden-variety self-tapping sheet metal screw. They invented it.
According to parts book terminology, the "retainer" is only used at the rear of the door glass. I've not inspected that far, but sounds like the bracket(s) must have been spot-welded, originally. If clearance is an issue, a pop rivet might provide more than a flat head screw.
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