'adjusting ring tool'

what kind of tool would that be ?

can't think of a thing.
what kind of 'ring' ..
something round like a piston ring... ?
or a ring that's a sound ?

perhaps something to do with an 'adjustment ring'  ...?

still wondering.

----- Original Message -----
From: "dylan" <insyncro@YAHOO.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, November 07, 2010 11:05 AM
Subject: WTB VW adjusting ring tool

>I know Small Car has a copy for $20.
> Anyone have a factory VW version they would like to sell.
> I need it ASAP.
> I will PayPal and pay for Priority shipping.
>
> TIA
>
> dylan