Here are 2 that we use.
Through-bag.
and QC with a brass tube, sprial wire inside to make it flexible, and then wrapped in airweave.
http://compositeforum.werksberg.com/attachment.php?attachmentid=212&stc=1&d=1159467203
http://compositeforum.werksberg.com/attachment.php?attachmentid=213&stc=1&d=1159467203