Did not want to "hijack" someone else's "thread" (pun intended).
Anyway, this is my "no problem" bobbin holder. I believe it is a J Dorian. Hard to recall as I have used it for over 35 years.
I did post a picture of this before and someone immediately said "that looks like an immediate thread cutter". He had never used one.
I have used it over 35 years and never had a problem, and I almost exclusively use 8/0 thread. Someone recently suggested they are being made again. I'm not sure. It is the best bobbin holder I've ever owned.