Square block material hows that aligned on a lathe?

[GeorgeD]

Whats the name of those hollow tubes that you insert into the chuck for protection of the workpiece? ie supposing I want to turn the end of a threaded rod from 10mm down to 8mm I need to protect the thread from damage,whats the insert called?

[irving2008]

Whats the name of those hollow tubes that you insert into the chuck for protection of the workpiece? ie supposing I want to turn the end of a threaded rod from 10mm down to 8mm I need to protect the thread from damage,whats the insert called?

soft brass shim, or even thick paper will do the job

[GeorgeD]

Oh bugger,I only need a soft metal tube near enough the diameter of the threaded rod then use a slitting saw to slice it tdown the middle. tsk!