@jay23 I’m not claiming the violet pen affects conductivity one way or the other. I suppose it could be related to the photoelectric effect, which of course would be good for conductivity. Now, if we were talking about the Red X Pen which, now that I think about it, could also be used on the fuse to enhance performance, then I would say it definitely does not (rpt not) affect conductivity. Nor does it affect vibration, RFI/EMI, or anything traveling through the fuse. 🖍