I posted a reply to this, but through the wonders of modern digital technology it got eaten. :p EnglishBob, thank you for your suggestions. I think I've checked for doubled vectors, but the PC creaks and groans when I'm zoomed right in so I might have missed a couple of spots when I was merging the points at the corners. I've mailed the file to Steve Shanks, but if an answer still proves elusive perhaps I might IM you then for an email address and send you the file? Foleypro, thank you also for the idea. I don't know Truespace at all, but if everything else fails perhaps that skinning option might be something to look at. Eowyn, hi, thanks for making me grin. ;) Steve, thanks again, the file is flickering through the Internet towards you as I type. Tony, you posted while the thing was chewing up my first response. Your offer is also appreciated, I'll send you the file if I can squeeze in another five minutes online. :)