I found some Snap-On 9/32 sockets at the junk shop today.  With the research I have done Snap-On made a 1/4 to 9/32 adapter.
I would be willing to buy one if anybody has one, or I will trade two of the sockets (1/4 and 9/32 nut size).  They are marked USAC, possibly meaning US Army C, or US Air Corps, I don't know. I also got a 9/32 Plomb slotted screwdriver socket and a #3 phillips marked Cal-Air.
Probably got a good deal, paid $1.99 for the whole batch.

Found an adapter on Ebay. I'm in business.