Mounting: insert the screw through the hole leaving the head in the inside of the spool. Paste with a little Loctite on the thread. Screw the handle at the other end until it stops; the handle must not falter but to rotate on its axis. Put them in 180º separated holes to balance the spool. The knob with tippet locking takes a washer to be placed on the outside of the spool according to the cover picture. To set the tippet, slide it between the three silicon rings.