Mike Barnes wrote:
In uk.d-i-y, PJ wrote:
I do not know the name to search for a supplier of the washer.

The washer fits in a slot to retain a hexagonal bar in a hexagonal hole.

It's a circlip.

If you're going to be doing more than one or two, a cheap pair of
circlip pliers might be a good investment.

e.g.

http://cpc.farnell.com/duratool/d000...set/dp/TL10179

Many thanks for all the replies, especially Dave for showing such restraint.
PJ