Recently rebuilt your transmission and want to try it before install?
Use this 3D printed adapter, a 1-1/2" socket (same size used to remove output shaft nut on BW), and a hefty drill to bench test your transmission.
So far I've tested 5 transmissions with a single adapter with no issues, but I've included 2 in this listing incase one strips out or gets damaged in any other way. (Sold as Pair, 2pcs)
The .STL file is available on Cult3D if you already have a printer, you'll have to go search for that one I can't link it here.
Feel free to contact me with any questions.
Fits Borg Warner Velvet Drive, Hurth 450/45a, as well as many other transmission with 26 spline x 1-3/8 apx input shafts