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I presented a clinic on soldering to the San Jacinto Model Railroad Club on April 5, 2011. These links to YouTube are segments of that presentation.
#1: Solder, flux, removing solder, tinning soldering tools
#2: Soldering buss wires
#3: Soldering track and feeders
#4: Soldering switch frogs
#5: Making an operating gate from brass stock
#6: Soldering cars and locos.
#7: Soldering 603 micro LEDs