left pic shows primer arm being activated, right pic shows it not,
with it "opened" (right pic) the primers do not advance.
When you want to prime again you swing the angled part back into the
"closed" position.
Wow nice work any chance you'd make some up to sell? I'd take 2 of those!
Dave, we met at Harvard I would like to buy one when your ready to ship.
Jay P.