Just got it just broke it - Fostech Origin-12 Charge Handle Extension

I have a quite a few things from Fostech and they are all quite expensive. Even this item is the least expensive thing they sell and it is still real expensive for a turned chuck of metal. I got it, applied loctite to the exposed threads, started to install it and the little set screw stripped the threads of the handle ? I was even using the small end of the wrench because it won't rotate all the way around. What a pisser, right before a match.