Thank you Mike! I've only had it for about an hour but my on/off is working great, and no problems with the 510 cap
threading. Screwed on the meter, a 510 carto and my 510 to 801 adapter with no problems

I popped in one of my old sets of batts so I don't know yet if the new batts are going to act weird like some have had.
Yes 5C, that's my Fusionator!