Billy Goat
WKR
The screw steel they use seems very soft. I am aware of other folks with the same issue. I think I have been through two summers with the Reckoning.
I don't think a torx would solve the issue because the issue is the worm drive starts to get resistance and I'm some cases seizes, and the lock screen seems to seize as well. So the heads strip out trying to work through the resistance or break the seize. The heads stripping seems to just be a symptom of the real issue.
I wondered if the cam load on the threads would wear them, it's less surface bearing than an axle shaft. It could be the threads are wearing into each other a little and flat spotting.
Could be something all together different as well.