Silver soldering small components

[kngtek]

Excellent craftmanship!

I have three questions on your technique:
Q1) How do you preheat the metal parts? Would a butane torch work in this case?
Q2) How do you measure the correct temperature range for soldering? Would Tempil Sticks (temperature-measuring crayons) work for this application?, or a thermocouple?, or a temperature gun?
Q3) At what point does brazing become necessary (in lieu of silver soldering)? Presumably the stresses on your parts during operation aren't high enough to cause the silver solder joints to fail?

Gary Kingsep (kngtek)