False assumption by me #2 - I was thinking all the threads we're Ti...
The back-end male threads seem to be SS. The female threads are definitely Ti.
Similarly, with the front end the mouthpiece is Ti, maybe the sleeve around the oven is SS too. Mine has hairline scratches that don't look Ti-esque (had a few from the box new).
None the less, Ti, Ni*, Al are all prone to galling, which I understand is the molecular shaving as like on like materials are grinded over each other. It's the principle utilised in cold welding. So it's worthwhile to clean either model GH, so the threads don't chew up and fail (there have been quite a few reports of this already, probably a mixture of this normal degradation and machine quality/tolerance^, mixed with harsh user conditions)
*ferromagnetic, thus if clip thread is attracted to magnets and is SS it has a high nickel contact so black grit city (Trying to clarify this and I think this isn't correct.. Apparently nickel makes steel non-magnetic by creating austentite structures)
None the less the SS will wear better than Ti but will not be impervious to galling
^the threads are really fine and close fitting which will mean lots of surface contact and travel.
Also if the Ti is SS on Ti, that might explain the grainy feel compared to the smoother SS on SS threads.
PS hoping for a swift recovery from brutal surgery!