Thanks Monroe. Like he said, I roll the tubes myself. Nothing particularly high tech, but I think the results are reasonably good. I did a couple of build threads on the technique. The first part is hosted here: http://www.rocketryfiles.com/?p=home&d=Technicalarticles/ The second one, which has some good stuff, isn't hosted anywhere that I know of (but if someone wanted it, it could be emailed). Ken, come git me! Jim This e-mail and any attachments contain URS Corporation confidential information that may be proprietary or privileged. If you receive this message in error or are not the intended recipient, you should not retain, distribute, disclose or use any of this information and you should destroy the e-mail and any attachments or copies.