Kaywoodie and Lee both used aluminum screw stems with stingers but there are differences in the execution of what is to me essentially the same design.
The Kaywoodie stinger was in two parts.
Up front on the stummel, there’s an aluminum disc that extends to the outside of the stummel when finished. Earlier ones were press fit and glued, later ones screwed in. Replacement could be done, but at the long defunct Kaywoodie factory.
The stinger of the Kaywoodie was machined as part of the front part of the piece that early on was press for and glued into the stem. Again, at the Kaywoodie factory they might have repaired one, but not since.
Amd I my experience no stem of one Kaywoodie fits the stummel of another, they were hand made to one pipe.
Lee used basically the same system with these improvements:
1. The Lee stinger is removable. All seem to be the same size.
2. Both front and rear Lee fitments were screwed in, and they are recessed. The joint between stem and stummel is invisible, and it looks like a push stem.
3. Since both parts were screwed in, the Lee is adjustable unless 75 years of tars have welded up the screw threads.
4. Even though it’s a technically more elegant system, I’d say a Lee that needs a stem replaced today is like a Kaywoodie, and there’s nobody alive that can replace the stem the same as it was when it left the Lee factory. They’ll convert it to push stem.
And, you’ll lose the pretty gold inlaid stars.