Securing washer – Sleeve nut, shock absorber

The shock absorber nut on the SQ4 has a tendency to come undone due to the rotational movement of the spring that causes the nut to turn by ever so small an amount. It has this effect in both directions but the nut only ever turns anti-clockwise because in the other direction it has to tighten the spring, which is too hard to do. Locking mechanisms only delay the inevitable result of the nut trepanning its way through the primary chaincase that has to be repaired with a baked bean tin or similar. The simple addition of a washer between the nut and the spring cup allows the spring to move without turning the nut.