Oh wait, I missed this edit:
"You can use the 5/16-32 die as a guide to help you index the 1/4-32 tap."
Edit: Won't work I'm afraid. The insert is shouldered/flanged on top. The tap has to enter from the top to short tap the hole for swaging.
Last edited by Glowgeek; 08-16-2022 at 02:09 PM.