be warend from the start if u have a stuck coil
u will strip them real fast
I start with a metal tool (powered off first of course) to make sure it's loosened up, then use the plastic tools.
I just turn it 1/4 turn one direction, then 1/2 turn back... then 1/4 forward again (to end up where i started.) the adjustment slugs are often melted into the plastic a bit and need to be released.
The plastic tools work great after that, power it up and adjust away.