Sure, only if you're buying the waffles :-)
Sorry but I was only on my annual summer visits to SJ/SF. I'm in Socal.
Picked up the jam nuts at my local hw store, McFadden-Dale, admittedly they specialize in all sorts of
fasteners, sorta like a mini McMaster-Carr.
You might want to try ACE, they usually have more fasteners than HD/Lowes, I've been saved
by ACE many times when a busted fastener kept the car from running again.
This morning I started with a new jar of beans and took me one adjustment, 1/12th of a turn (1/2 of an edge),
to dial it in.
Just a thought... I'm sure you'll be able to find the standard sized 1/2-13 nut but perhaps not the half-heights.
Perhaps adding just one jam nut between the adjustment nut and the crank might be better than none at all???
At least you're less likely to round out both the pin as well as the holes in the adj nut. I now use an allen wrench
and eventho it's not correctly sized, at least it's not tapered like the pin and works much better. If I get all fancy,
I'd tap the holes to accept the adj pin from the Super Jolly or just use a long bolt.