dinos22 > You can see the spikes on an O-scope.
gaz_az > first of all, a friendly advise. I want to make clear that the mods I've done would really make a difference only in extreme benching conditions; as you say you have no real experience with electronics, some of the mods are pretty delicate and would be better left untouched.
1. You need to use the middle pin and one of the other two; I always use the ones marked in red in the small photo so it will decrease resistance (thus increasing voltage, in most mods) when you turn it clockwise. It is VERY important that you will set the pot at max resistance (screw it counter-clockwise until you feell it "click") before installing it in the circuit, and remember to always use a measuring/monitoring device to see what you are doing.
2. Yes, you need to remove the original resistors and it's better to use a hot-air soldering tool for this; you can do it with a regular soldering iron also but you need to practise on some dead hardware first because it's rather delicate and you can touch nearby parts and unsolder them by mistake too. The mods can also be done without removing the original resistors but there are some reasons i chose to do it this way: more linear and precise adjustment, the posibility to use resistances lower or HIGHER than original ones for testing purposes etc. If you want to do it without removing the original resistors, you need to have pots with 10x times the original value (1Mohm instead of 100Kohm in this case).
3. If you connected the pots as described above, you will turn the screws clockwise to start making adjustments. Always monitor what you're doing (measure the resistances for Ilim and PWM freq. mods with the PC turned OFF), and push it little by little.
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