Copied this from the diesel list; you never know what can go wrong.
From:   backintime@triton.net (LAWS HOME)
Sender: owner-diesel@vwfans.com
Reply-to:   backintime@triton.net (LAWS HOME)
To: diesel@audifans.com

Big THANK-YOU to all who responded to the stuck heat shield. Not only for
the tips/ideas but the inspiration that drove me on to victory! This is
truly a great community, I also noticed that someone had sent this to the
vanagon site as well, so I will also thank them too. I went back at it again
this a.m. not sure what the wind chill was but it was darn cold. Probably
around 20F with a 15-20mph. wind. I know that isn't what was meant by trying
"extreme cold" as opposed to heat! I ended up heating the (trying) shield
again with my propylene torch and then I cycled the glow plugs a couple of
times to heat it from the inside. I tried some more "shooters choice" and
"cleansoil" then vibration again. BTW I had tried the
turn-it-over-and -blow-it-out method yesterday before I broke the piece out!
I ended up using a 5/16ths cold chisel and a 4 pound hammer, I tapped just
hard enough to crack it ( listened for the odd ring ...thud, thud....tink!)
once this happened I just moved over about 4-5mm's and did it again which
broke a "pie shaped"  piece loose. I used my modified surgical towel clamp
and worked it under the shield and worked it loose and lifted it out. The
debris that had dropped into the engine was successfully removed with a
magnetic tool on a flexible rod ( you can bend it in odd angles) I fished
this around until all the pieces were accounted for , plus a little extra
carbon dust! When I fired it up it didn't smoke ( now I have to get used to
that!) I more than likely will have better economy too. I called the P.O.
and my guess was confirmed...I removed the original injectors @ 170k miles.
I always wonder why people don't do maintainance like the manual tells you
too.   Injectors..test or rebuild EVERY 60k miles. Yes , I ALWAYS use
anti-seize when reinstalling parts that will be in there a while!  I will
report back as to whether my rock solid 37mpg. changes. Tom