Early Husky Ratchet

[Northwoods]

Having lots of time on my hands these days, I decided to straighten out my New Britain/None Better/Husky drive tools.  I didn't get much done--and ended up on the only alternative open:  the bay.

Found an early Husky ratchet and it came in the mail yesterday: 

https://www.ebay.com/itm/Antique-Vintage-Husky-Socket-Ratchet-Wrench/153877982857?hash=item23d3d7ae89:g:x4kAAOSwD89efP-0

Two things help me date it as being from 1924-1928, according to AA:  The fact that it is the Husky WRENCH Co. instead of the Husky CORPORATION, and the fact that it comes from Milwaukee instead of Kenosha
.
Mine is just like this one from AA except that has a square 7/16" pinched screwdriver drive plug  with only one detent ball and is not suitable for use with sockets--and mine has no writing on either face at all.  http://alloy-artifacts.org/Photos/tools/husky_916hex_no1_ratchet_pend_milw_f_cropped_inset.jpg

About half of the original black paint/japanning remains.

So, what do I have?  What is the intended use of the screwdriver plug?  Oil pan screws?  I have seen this plug with Duro/Indestro combo pressed steel ratchets.  All this makes me want to buy more old Husky drive tools.

[Bill Houghton]

The screwdriver looks very much like a drag link socket.  A drag link:

A lot of the older drag links were adjustable, with a ball fitting into a two-part socket, one fixed, and one at the end of a threaded plug fitting into the drag link end.  As it wore, you would pull the cotter pin locking the plug in place, thread the plug further into the end until you'd removed the play, then insert a new cotter pin.

I've got one drag link socket, but never expect to own a car or truck that age (again/anymore), having long since lost the desire to work on old cars.  But I'm prepared, by golly!

[Northwoods]

Thanks so much.  I have heard of and seen drag link sockets, of course, but never looked to see exactly what they are.  So, do you suppose there might be a 7/16" two-ended plug out there and 7/16" sockets as well?
Or was this tool dedicated to steering gear work?  The screwdriver head shows no wear at all, and so has had light use. 
Anyone have some Husky sockets that are just a little too tight to fit a 1/2" driver? 
I remember having and selling a Blackhawk 7/16" (I think) speed wrench to a fellow from this site.