Happy to provide any info I can! I'm not going anywhere... this has been one of most historical W&A threads ever!! :)
Your set was made in the mid-late 30'- early 40's... no later because W&A started using Rocket lugs in the early 1940's.
Unfortunately.. I have not come across any of the female style t-rods in my W&A collection travels. They are so rare... so is the male style lug.
I've only seen that t-rod/lug combo on drums in the W&A catalog... yours is the first I've seen on an actual kit. (just awesome)
However, W&A did make hex style female tension rods up to the 50's. I have a few snares with these lugs but no extras... sorry. Trying to think something you can use for a functional replacement... keep you posted on that.. but hope someone on this forum has the real deal for you.
Big Blue is a VERY special kit! SO glad you found her and brought her back to her true glory!