As shown in the pic below, we need to replace Bolt #3 which shown encircled.
B) Tools Needed:
5mm hex key with ball end
6mm hex key
Additional 5mm hex key or hex combination tool
1. Insert the ball end 5mm hex into the drive side (right) bolt.
Insert the second 5mm hex into the non-drive side (left) bolt.
While holding the drive side hex in place, loosen the non-drive side bolt by turning the hex key counter-clockwise. With the non-drive side loosened, the drive side bolt should be able to be loosened and removed with your fingers.
Thread the non-drive side bolt out and remove the countersunk washer. Thread the bolt back into the non-drive side.
While applying upward pressure on the pivot, gently tap the non-drive side bolt to push the center pin through.
Apply upward pressure on the pivot and remove the drive side brass bushing from the center pin.
Use the 6mm hex to gently tap the center pin towards the non-drive side, while taking care to not damage the threads.
While applying upward pressure on the pivot, remove the brass bushing from the non-drive side.
Thread the bolt into the non-drive side and while applying upward pressure on the pivot, gently tap on the 6mm hex with the mallet to push the center pin towards the non-drive side.
Gripping the bolt and the center pin while applying upward pressure on the pivot, the center pin can be pulled out.
This is how the pivot should look at this point.
D) Installation Parts Supplied
(Oil or grease all supplied components for easy threading and sliding.)
Apply upward pressure on the pivot and begin tapping the new center pin into the pivot.
2. Insert the other parts in the sequence as numbered from both sides
Tighten the Castle Nut using an adjustable wrench if you do not have the exact wrench head, such that the pinhole (On the centre pin) is visible between the two pillars of the castle nut. Do not overtighten the castle nut.
Once the castle nut is aligned insert the Cotter Pin (Part number 5) and push it fully in such that the head of the pin is almost flush between the castle nut’s pillars and then bending its arms outwards in opposing directions such that they wrap around the castle nut tightly.
Put the plastic cap by threading it on the remaining portion of the centre pivot pin, this will close any visible part of the pivot and prevent contamination.