Just incase anyone is unsure how they work or how to fit them see the following -
Thanks to Justin for the washers - Credit where its due
Measurements -
Tools you will need for this -
5.5mm Allen key
21mm Deep Ring Spanner
or 21mm socket and rachet (1/2inch is better)
So in pictures.
Tools all lined up ready to go.
Need to undo the top nut - The Allen key is vital here - So do not attempt without it.
Put Washer in place.
This is how it should look.
Put the rubber doughnut thing back on again as well - The 3mm Washer clears the doughnut off the turret as seen above.