I pulled the pin that holds the outside trim in place, removed the cotter pin that connects the latch to the linkage arm, and poked and prodded just about every which way on this thing, and haven’t found any holes or access points to any hidden retainers. No C-clips, either, unfortunately. The pin that holds the inside knob in place is more of a rivet, and peened in place.
The square spindle inside the heart of the mechanism slops back and forth a little, but not enough to allow me to remove the two steel ‘wings’ that retract the latch. After a thorough soaking of Triflow, we can finally insert the key, but it won’t turn.
Were any of these locks assembled with hidden spring retainers that required a drilled hole for disassembly?