I've been diving a Mk-20 for years with no problem or hint of a crack, but when I get home, I'll take a good look to make sure I didn't miss something.
The link you provided is a bit suspicious. The NOAA header appears to be a cut and paste job. While the real form may look that way, but it's unusual enough for me to want confirmation before spreading this notice around in public.
Lee
-----Original Message-----
From: Giovanni Marola <[log in to unmask]>
Sent: Jun 1, 2005 4:59 AM
To: [log in to unmask]
Subject: [SCUBA-SE] cracks on MK20
Has anybody more informations about possible cracks on mk20 first stages?
http://www.ndc.noaa.gov/pdfs/sb05-01.pdf
Giovanni