When to replace tangs

[knothead]

Have you considered having them x-rayed?

Here's a couple of links.

The American Society for Nondestructive Testing
http://www.asnt.org/

The following is quoted from this article.

http://www.irwinyachts.com/Drawings-...hainplates.pdf

"In February 2003,
Trinidad Inspection Services Ltd.
charged me US$130--six shots at
$21.66 per shot."