Ultra-Vend 3-head coin door lock?

[Ryengoth]

Does anyone know if a regular gumball lock will fit this door?
I see a small recess in the barrel but there's not much room for a cam like you see in a gumball top.
The radius is 3/4".

[Ryengoth]

I re-tapped a spring clip and cut the retainer off to make a thin washer with a nut that fits in the locking tab on the case. A standard barrel lock screws into it. Could not find a decent priced replacement.