I can find 1/4-32 taps and dies all over. During my searches, I came across someone looking for a 1/4-32 set screw for a bridgeport milling machine. Not sure if that's what you were referring to when you mentioned HQT, but it appears that may be just for taps/dies/cutting implements for the mills. I searched on their site and came up empty on any 1/4-32 hardware.
The link from Classic and Exotic Service looks somewhat promising. It looks like I may be able to have P/N J-990-17 machined into a flat head machine screw.... at least the thread pitch is correct, so there is something to start with.
I will keep that in my back pocket in case I am not able to source an original screw.
At least you got closer than I did. I could only find 1/4-32 in brass, which is worthless for this application.
Thanks again, It's something to go on should I end up empty handed.
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