Re Stenlights
Wormster kindly supplied a knackered one for me to dissect.
There is a PCB which mounts everything at the back of the lamp. Switching is analogue through a series of magnetic switches in a half circle activated through the casing by a tiny magnet set into the stainless steel rotating switch. Anyone stripping a lamp should take extreme care not to loose this, it just drops out. Light direction is through plastic optics.
The PCB is fixed in place by thermal adhesive, its difficult to remove without damage and I suggest a repair would necessitate a new PCB.
Internally, its exactly the same size as one of my Dragons (pure coincidence, honest) which lead me to initially believe that I could create a "StenDragon", but other differences make this impossible. Dragons use reflectors behind direct bonded glass, plus some other issues.
There may still be a repair service available through the person who was UK agent when these were available. I dont know.