HI Pappy,
I'm not much help to you as I've never played with my torsion bars but I'm sure someone will chime in.
If the bolt broke off, did you unbolt it partly then it snapped? If it didn't budge, you should still have the same tension, if it did move, I dunno, depends how far you turned it out.
They do sell new bolts and the adjuster that it goes through. Hope it all works out!