thats frustrating, I fixed everything that I know could be wrong with them
try out these masts, there were a few minor things I missed before, but some of them didn't appear to have any problems
http://dl.dropbox.com/u/43901618/CArmstrong/Models/Kriswood's HMS Centurion/mast4.gm
http://dl.dropbox.com/u/43901618/CArmstrong/Models/Kriswood's HMS Centurion/mast3.gm
http://dl.dropbox.com/u/43901618/CArmstrong/Models/Kriswood's HMS Centurion/mast2.gm
http://dl.dropbox.com/u/43901618/CArmstrong/Models/Kriswood's HMS Centurion/mast1.gm

try out these masts, there were a few minor things I missed before, but some of them didn't appear to have any problems

http://dl.dropbox.com/u/43901618/CArmstrong/Models/Kriswood's HMS Centurion/mast3.gm
http://dl.dropbox.com/u/43901618/CArmstrong/Models/Kriswood's HMS Centurion/mast2.gm
http://dl.dropbox.com/u/43901618/CArmstrong/Models/Kriswood's HMS Centurion/mast1.gm