Juma is apparently going to send the rebound kit to existing customers later this spring.
And they are working on a harder steel cam(metal t plug), which should fix my issue.
He says to be careful of applying two much preload to the plug. Although I’m not clear how applicable that advice is given that when it failed I had only applied one or two turns. And when it first snagged it was stock out of the box, no additional preload.