Williams is now using a 7-slot extruded bell crank instead of the older 5-slot machined crank. Very nice design! This gives more control over the balance of the pulls.
Also, Bill tells me that his crossover patent has finally been granted.
I hope to see one of Bill's crossovers @ St Louis this year. I'm surprised W Pauly's D10 crossover is still for sale here on the forum? What do you think of your new D12 b0b?
Can't do much better than that I'd say!
I saw Bill's crossover mechanism last year at ISGC. Not only does it work like a charm with what seems to be a minimum of parts, it's actually beautiful to watch the changeover.