that's a good question avi8tor.
there doesn't seem to be any type of head or notches if it is a screw.
-- i originally thought it was a punch or sorts that i could punch out and replace.
another guy on a diff' forum said to unscrew the adjuster there, but i gave it a pretty manly twist and it won't budge. (just want to avoid wrecking the piece)
no worries, i have an email into pazzo.
cheers,
-b