I just got a br340 bp blower and want to take those little red caps? or whatever is on the high and low adjustment screws off. Id like to adjsut for a little more high than it will let me, I run amsoil 2 stroke mix and feel comfortable doig it. Has anybody else removed these before? On my echo gear, I used to be able to just pull them off with pliers. On this stihl, its set inside a housing of some sort.