Delrin tenon failure avoidance

[n80]

I usually twist them back and forth while pulling.

[Adui]

Of course the best method is to thread your tenons

What happens when a “lefty” habitually turns his tenons the wrong way?
DocAitch

You slap them and tell them to do it properly. Seriously though, the glue should still hold for turning both ways, the difference being if the glue does fail the tenon is still perfectly functional and much easier to repair/remove.

Do left handed people turn then counter clockwise? I am left handed and turn them clockwise, but I may have a sub conscious bias of course.

If you do I do. Left handed, taught by my left handed father, confirmed by my left handed grandfather (Maternal) Unless its lefty threads which is possibly even more rare than a left handed person turn it CLOCKWISE!

[DocAitch]

Actually, I think a common response is to UNSCREW the tenon from the mortise, because that is how we deal with anything else that is removed, including Kaywoodie stems and the old bone screws in meerschaums.
DocAitch