And, I had to make some knitting sheaths with adapters:
Knitting sheaths and Adapters for different sized needles
I have knit with ALL of the above knitting sheaths and adapters and they work. The adapters are interchangeable between all of the knitting sheaths and any knitting sheath can use any of the adapters. Needle sizes run from way too small for elves to big enough to plug the Gulf Oil Leak. (Number of black bands reflects needle size.)
The adapters need to be a wood that is as hard as rock maple (or harder). The knitting sheaths can be softer woods. For example ebony and walnut work well together, as do maple and maple, maple and ash, or maple and oak. The male fitting on the adapter needs to be ~3/8" and the knitting sheath needs a thickness of ~1/4 on each side of the adapter or it will crack. Thus, the minimum thickness/diameter of the knitting sheath is 7/8". The adapters can easily be made from 3/4" stock.
Do I like using them? Not really. I prefer just using a knitting sheath made for that needle size. However, I tend to work with a very limited number of needle sizes and I do not like the kits of circs with interchangeable needle tips either. But, that is just me, and many knitters do like the kits.
When I first knit with a Yorkshire Goose Wing knitting sheath, I was amazed at how ergonomically and comfortably the goose wing fit against my body. After more experience with the turned knitting sticks, I have to say they are just as good and perhaps more versatile.
A quick review of Brears reminds us that while Yorkshire had the goose wing knitting sheaths, they continued to use the turned knitting sheaths.
I had some of these at a KIP the other day, and the adapters kept falling off and -- hiding. This design is not good enough.