it's said the other Obi stunt that is all smooth was
http://www.proparchives.com/science...du-fighting-saber-blade-from-star-wars-ep-iii
" It is made up of about six individual components which all lock together via a steel rod that is bonded into the carbon fiber blade. This rod slides down inside and screws into the end of the saber and then is locked off by two tiny allen screws holding it all firmly in place."
http://www.proparchives.com/science...du-fighting-saber-blade-from-star-wars-ep-iii
" It is made up of about six individual components which all lock together via a steel rod that is bonded into the carbon fiber blade. This rod slides down inside and screws into the end of the saber and then is locked off by two tiny allen screws holding it all firmly in place."