Partially homemade tool?
My Cornwell dealer gave me a discount on a 1/4" ratchet that had been sitting on the truck for a few years. I didn't take a photo before I started but it had a soft handle like this with a weird concave square profile where the guy's thumb is, that had to go.

Pulled that off to reveal a round shank with pressed "wings" like you might see on a screwdriver blade.
I cut the wings off leaving a round shank, then slightly reduced the diameter of the last 1/2" or so with a file and cut 5/16-24 threads with a die.
I didn't have a lathe to make the new handle, so I used a 1/2-20 bolt, nut, and some washers to mount a threaded chuck (spare from a cordless drill) in the middle of my drill press table facing upwards. I used that as a static tool holder for the drill bit and used the drill press to spin a length of 1/2" diameter brass rod.
With a little trial and error, that gave me a blind hole approximately in the center of the new handle. I made the hole stepped so the larger diameter would just go over the shank and last 1/2" or so was smaller where the threads go. That also gave me access to get the tap down to the bottom of the hole.
Then I just used a file and some light sanding to match the taper of the handle where the two pieces meet and rounded off the end.
I did try bluing the brass to be darker like the steel which looked cool but wore off pretty quick with use, hence the few dark spots.
Not a professional job, but it was fun to make and I think it turned out ok