RE: Soldering Landing Gear Wire
"The best result would be from silver solder, which requires a higher temperature torch (not an iron or gun). "
I would take exception on that. Been doing this sort of thing since the mid 50's, and the problem with any torch, is that it is much too easy to oxidize the surface, then nothing will stick. I have always used standard 60/40 radio solder, and a large Weller soldering gun (260/200), and PASTE flux. Thoroughly clean the surfaces with a scotchbrite pad (not steel wool, tends to leave steel particles), tin, tack together. Then wrap with copper wire, and flow solder through everything.
Les