Eggtimer Rocketry Eggtimer Quark Assembly Manual page 10

Mount the Top 100K resistor
Tin the right pad of the top 100K resistor, marked "104" on the right side of the board.
___
___ While heating up the tinned pad, place the 100K (104) resistor on the center of the pad.
Remove the soldering iron, and let it cool for 5 seconds before you let go of the resistor.
__ Solder the left pad of the 104 resistor. Check both solder joints with a 10x jeweler's loupe
to make sure that the solder joints are nice and shiny and that they cover both the resistor and
the pad. Reheat and touch up the solder joints if necessary.