Are you certain that the toggle is closing all the way on the subsequent round? If the knobs are up just a bit the gun will not function. Try bumping them down (pointed downrange of course) and see if it will go boom, or at least click, then.
Somehow in the back of my mind I'm envisioning some 80 years of hardened dirt and grease in the toggle or rust/lead/dirt in the chamber.
A good cleaning may be in order.
Happy New Years all!
dju
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