thermal guy
Flashaholic
Or was the old hds 32 tpi? Now I'm confused
They are not.I don't think the U60 and Ti Ra Clicky are thread compatible
.... BTW, there are three thread types. The original (before so-called "Legacy") HDS lights, and later the Novatac lights use a fine V-shape thread. The "Legacy" lights like yours and my HCRI 100 have a coarser V-shape thread. And of course the current generation is the ACME thread....