WANTED: Thumbscrew for this unmarked reproducer

[Jwb88]

I need a thumbscrew for this oddball generic reproducer. The thumbscrew from my Silvertone Truphonic reproducer fits it perfectly. A Victrola No.2 is just slightly too small/loose. Other than that I have nothing to go on. Anyone know who made this? It looks pretty boring but--despite hard gasket material that has shrunk/doesn't meet, and the fact that I can blow in the neck and a stream of air flows right through it--it doesn't sound too bad. So I think it has potential and is worthy of a thumbscrew.

Just thought I'd check, even if it is a long shot. Thanks!

Photos show it with the thumbscrew from my silvertone installed; then my silver tone, just for reference.