I've got a Kundert Drop Spindle. It spins beautifully and I do like it a lot. HOWEVER.....if I drop the danged thing (and it does happen) while spinning, the cop (Spun fiber wrapped on the shaft) pops off.
I have emailed the maker of the spindles who replied something like, "Hey, I just make them. I don't spin with them. Ask a spinner." Oh OK whatever.
If you have any answers, please let me know!
The picture is of Vicki, with her I MUST KILL YOU NOW! look. Which is just added for fun. Dave is in the background doing...........something.