Dropped my tenacious yesterday on croncrete, blade popped open, chipped it up, knocked it loose, and got grit lodged in there. Fixed the blade edge up, blew it out and readjusted the blade. The blade had some grit in it still so i pulled the blade off and cleaned it out. The blade had 2 brass bearings per side. My question is are they all the same? Look the same to me. All four are thin with 5 holes in each.