@lloydc - When it comes to RCA plugs I onty use KLE Innovations Harmony plugs.- they are the easiest plugs to attach to the wire I have ever used
I have tried each model (except the Perfect harmony) and settled on the Absolute Harmony.
I did try the original Eichman Silver Bullet, but this was superceded with the Copper Harmony, Silver Harmony, Pure Harmony and finally the Absolute Harmony.
There are now some other Low-Mass RCA plugs, but I have not tried them as yet.
I use a Eutectic solder because it becomes solid once the iron is removed - this makes for an excellent joint that is also very strong.
- I found that with the WBT 4% silver solder, you had to wait for it to make a solid joint
- any movement impacts the sound quality and strength of the joint
Godo luck with your quest - Steve