How to make a modded controller
Things you will need...
1.a torx 8 or 9 security screwdriver
2.an xbox 360 controller
3.sauder iron
4.sauder
5.24-30 gauge wire
6.momentary push button
all of this stuff besides the saudering iron can be bought at radio shack. the saudering iron can be purchased at home depo.
steps...
1.take apart your controller by taking out the 7 screws on the controller
2.tape your buttons down before you open your controller.
3. take your mother board out and prepare to sauder.before you sauder though make sure your controller has a resistor 
no resistor no rapid fire.the first sauder point is in the lower right hand part of your controller
sauder your first wire to that point and then attach it to your button. the next sauder point will depend on your controller. this video will show 2 of the 4 sauder points i know