Every once in a while, I have experienced something similar and it has boiled down to the hand piece selector knob. I just run the knob from one hand piece to the other, making sure the knob is fully turned to the proper place. I frequently switch from one hand piece to another and sometimes I...
It's a little tough to tell what's going on here from the photos. As a retired goldsmith, I think there are a couple things that could be causing the problem. When the solder balls up like this and won't flow, it could mean that you have used up your flux....too slow to heat? And/or your...
Some knife makers like G-Flex epoxy, you get about a 70 minute work time, if I remember correctly. I use and like it. I Buy it from Jantz knife maker supply .