@Bruce - Yep, the turnbuckles for the flat cars that are still adorning my bench. I am making them out of 0-80 nuts and some copper ‘bus bar’ from an old track lighting fixture. You can go to any HVAC supply house and get a paste flux/silver solder in one. Not cheap, but it beats the extra steps of first fluxing and then soldering. I also figure that a small dab placed where you want it, heat it, and the joint is made with minimal mess. Time will tell after I start attempting to use it. This unit is also a bit smaller than the PBL, it is only 100 watts. It might be more controllable, again time will tell.
@Bob - I am usually the guy following the guy that gets the good stuff. Been the story of my life for six decades. About time it was my turn.
@Steve - Just do an Google search, there are several good articles on building resistance soldering outfits. The one I was planning on following used an old car battery charger. That article has been about for a long time, so I figured it was well proven. My problem turned out to be my usual source for that kind of an item was the good ole fashioned ‘garage sale’, but they don’t seem to be there any more. I can round up what I have found on the net and post it on my web site for down load, as I feel if it is on the net it ain’t copyrighted (unless specifically stated).