You might want to put it back on and then take the band off of the back
of it that has the air tube on it.Then being careful,take some fine
emory cloth and with the eng. running,and the cloth wrapped around a
small popsicle stick,you can clean and polish the arm.Sometimes you get
a buildup from the brushes on it.If it works,you will get power at about
1100rpms or so.Jim