On 2012-01-04, steamer wrote:
--There's a simpler way to do it but I don't know the proper name
for the part. Basically it's a jam-fit washer; it's got little fins on the
i.d. that bend to grip the shaft it's slid onto. Very hard to remove but
very easy to install and they're really cheap. You can probably get 'em at
an auto parts store.

I think that the official term is "Tinnerman fastener"

Here, one of the first that I found with a Google search, under
the name "Rectangular Push-on", but also look at "Plastic Cap Push-ons"
and "Round Push-ons":

http://www.abcorfasteners.com/

The rectangular push-ons go down to smaller sizes, but the round ones
don't have sharp corners waiting to nick you. :-)

Enjoy,
DoN.

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