Seeing the light

I'd try using a dark green marker pen, and draw a fairly heavy line around the (SE) bulb at it's largest radius when cool, let dry thoroughly.

Twl, I couldn't have said it better, you ARE a very qualified reviewer, such a detailed report. Guys like us must have BH or Doctors degrees hidden in our audio archives. BTW, thanks for the mention of my marker tweek, it's nice to know we're out there.