Sorry if I didn't post clearly..he's using the JB Weld where the factory plastic piece is that holds the shafts and lets it slide together. (drilled it out to make his new steering). One side is Factory welded, the other slides in and out to make it easy to remove the steering link if he ever needs to.
It's 100% Safe, I assure you, there's no possable way for it to come loose, or slide apart with 2 U-joints at each end. It's not a road rig, so no worries about it comming apart and killing someone on the highway.
Mine is welded (so you all can breath easier) and it's been a great little mod on my sami.