Two options from Stonfo for Bobbin Threaders. Type 1 is a single wire with a tiny hook at the end and Type 2 is the standard wire loop type.
STONFO Bobbin Threaders
Anglers Image Magnetic Tippet Threader
Cabela's® Bobbin Threader
Z797 Wooden Fly Tying Standard Tool Kit, Fly Fishing Vise, Bobbin, Threader, Bod
5 Pieces Fly Tying Tools Set Fly Tying , Bobbin Thread Holder
Fly Tying Tools Standard Tying Thread Bobbin Holder Fishing - Temu
2 Guys and A River - For the love of fly fishing
Kids Fly Fishing -- The Next Generation
The classic whip finisher with a powder-coated ergonomic body. The base of the tool has been sharpened, so that finishing flies and clipping thread can be accomplished with one single tool.
Loon Outdoors - Ergo Whip Finisher
Creative Angler Bobbin Threader for Fly Tying, Fly