Bearing cup installer.
Adjust the threaded rod to the start length, then turn the handle to wind the cup or seal into place. I have made two sizes of drivers. These were used effectively on rear hub bearing cups and the seals in axle tubes. Thats why the extra long threaded rod.
These photos were taken before I welded all the pieces together.
Endless variations on the theme are possible. Not sure if I stole this idea from the manual or just had a vision
