I tried to teach myself how to throw a 'hawk. I absolutely destroyed the shaft of a Trail Hawk. The set screw dug in, but after a few (or a lot) of bad hits, the screw just dug a trough in the handle as it was forcefully smashed back down towards the grip. That's what happens, I suppose, when you repeatedly hit the target with the wrong end.
Eventually I made some langettes (?) to support the head, in and effort to prevent the head from sliding back down to the grip, and destroyed those as well. The head just kept slipping down. Then I drilled holes through the handle and used small bolts, secured with nuts, running all the way though the shaft. The bolts were between 1/4 and 3/8-in, and utlimately just doubled over.
The head is fine, but the shaft is toast. I bought a new Trail Hawk to use for motorcycle camping trips, and was going to order a new shaft for the old one, but figured I probably should get some instruction first, to save a little bit of wear and tear on the next victim of my throwing education.
Eventually I could stick 4 to 5 in a row, but never 10. Often it's still 3 or 4 tosses to 1 good stick.