For what it's worth, they (the FAA) do not generally permit solder type
repairs in the aircraft wiring, I believe due to vibration concerns and the
QC question of the solder joint. I am not suggesting that soldering
/shrinkrap is not acceptable in this case, but rather as food for thought.
The high-end crimp type connectors are much higher quality than the FLAPS
type. I purchased a complete assortment from Hi-Line. You can get smaller
amounts from Aviation Spruce and Specialty, which caters to homebuilt and
experimental aircraft builders.
Cheers
Duncan Cameron
85 Westy
86 Syncro
64 Cessna 180