We Make these here at our facility they have many uses
there good for installing shaft corks for Tungsten or Lead Powder,
removing old epoxy suck in the bottom shafts old Swing weights.
Heating Rod from inside to remove stubborn heads.
Also use to calibrate inside measurements inside shafts.
They come in 2 sizes 3/16 for heating an Ramming Corks,
and 5/32 fit most graphite mandrels (The Taper Hole in Shaft)
46″ Length 3/16 .175 I.D
46″ Length 5/32 .156 I.D Most Graphite