You don't need to take off the limiter caps to deal with the 0->6000 feet. They only limit "richer", not leaner.
They are already set for close to sea level, and allow you to turn them clockwise (leaner) for altitude. All you need is a small screw driver - the one that came with (or was supposed to have..) your saw.
Don't use a screw unless you are really careful and reverse the cap direction to line up the tang and slot... most mess them up and have to dig them out.