Thanks for the comments, very much appreciated :thumbsup:
Some of the "slip fit lights" are held together via a strong neo magnet soldered to the driver & switch and tube friction.
I don't even have taps & dies so the lights with threading are parts that I have found to use :thumbsup:
Not at the moment, I have given most away.
Thanks for letting me know.
But really, it's time to start your own flashlight design company. ;-)