[support] Possible to get the "Read More" on a CCK field?

I couldn't get the "Read More" link to show in teasers for one of my content types, then realised it was because the main text field in that content type was actually a CCK field, not the default "body" text field.

There are a couple of comments on d.o but nothing definite about how to get the Read More link showing. Is there something really obvious I'm missing?

this is what I have on my other node types and the link shows up fine:

<?php if ($node->links['node_read_more']): ?> <div> <a href="/<?php print $node->links['node_read_more']['href'] ?>"><?php print $node->links['node_read_more']['title'] ?> </a> </div> <?php endif; ?>

thanks in advance

Neil