How to open up a Quark?

[suicideneil]

I believe there are sticky thermal pads holding the case to a hear spreader, which is then stuck to the fets, so you have to spread the sides of the esc open, then carefully prize the case away from the pcb. PCB (Printed Circuit Board) is the name of the esc board itself; 100watt iron is a little on the hot side yeag , I would say your 30watt iron is fine- you want a fine tip since you're only soldering a tiny little wire in place with a tiny blob of solder.

If you do a search for 'quark' or 'quark 125b' on this forum, there should be plenty of threads on opening up & modifying the esc- it was very popular several years ago, so lots of threads on it if you go back far enough.