My friend, Jon Titus, KZ1G, sent this to me a couple of days ago. He writes:
Here’s a presentation I gave at our club meeting on Saturday. One of our members gave me some PL-259s he bought at a junk shop. Probably from old military equipment. I couldn’t take them apart so I cut one apart to see why. They used this soldering technique that seems to simplify assembly of PL-259s with RG-58 cable. I have used it with good results.
It seems to me that this would work just as well when putting PL-259s with the UG-176 reducer onto RG-59 and RG-8X coax.