ok so ive got my variotop put together with the 2 lightest and 2 second lightest weights on it for slow opening with the clutch pulley. my question here is, there are these four plastic tab thingees that i dont know where they are supposed to go. i assume they are supposed to be some kind of a "stopper" because i dont see whats supposed to keep in a one piece deal. it still two pieces that as far as i can tell, the belt will be the only thing holding them together? whats the deal here?