A far less technical response:  when I wanted to level the ride height on
our '88 GL, I made spring spacers out of plastic kitchen cutting boards.  I
think of them as nylon but I doubt that, polyethylene maybe.  Cheap, readily
available, easy to cut and shape, after almost 2 years, no change at all.
No warp, no crack, no flow, no rot, rust or corrosion, and it didn't go off
in my pocket!

Gary
----- Original Message -----
From: "Jonathan Lewis" <maestroman@WORLDNET.ATT.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, January 12, 2002 10:11 AM
Subject: Re: Leveling the van- shims made of teflon or nylon.....what's up!

> Acrylic  plexiglass  [brittle;see below]
>
> Hmmm, anecdotal evidence on PMMA or polymethylmethacrylate (limited
> statistical basis of 2 units) 16 + years, no change in thickness,
> transparency or phase. Hard to do better, easy to do worse.
>
> Frank Grunthaner
> You're right about the acrylic Frank: should've just noted problem with
solvents; aging NOT a problem[with acrylic  =8)  ]    JinNJ