Hi Gary

I wish it was me that made it go pop, at least i would have known what happened to it? I'm just putting together some more bits for my mill build and a friend of mine had these laying around so i hoovered them up. I spoke with him today and he said he bought these from you way back. The interesting thing is he said that he did reverse the polarity in haste to get them into his machine by following the wiring of the first one he put in (this was a different make). Do they have a protection diode on the V3?