They wear to a point and then they disintegrate. 

Dennis

-----Original Message-----
From: Neil N [mailto:musomuso@gmail.com] 
Sent: Friday, February 06, 2015 2:02 PM
To: Dennis Haynes
Cc: vanagon@gerry.vanagon.com
Subject: Re: Removing stuck O2 sensor-valve adjustment.

.... and those parts aren't cheap.

van-cafe has them:

http://tinyurl.com/posf2z6

It occurred to me that it might be possible to square up the face of a given malformed used screw but I bet that would be a BAD idea.

'false economy' as they say.

Neil.

On 2/3/15, Dennis Haynes <d23haynes57@hotmail.com> wrote:

> .... If you really feel the need plan to replace the adjusting screws.

Neil n

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