Washer on speedometer cable - need some help.

[A V]

I have seen on Glenn´s Alfa Repair & Tune Up Guide, page 103,that «there is a small washer at the end of the speedometer cable which should be wired to the end of the cable to keep from losing it».

Don´t think I have ever seen this washer or then I have lost it.

Can someone help on this? Is there really a washer and if so would thank some information on it - size, dimensions .....

A V