FireKist Necking Tool
Silica Bronze V-Blade -
Silica-Bronze works a lot like graphite , it is smooth
without having to prep it with bees wax.  And will leave the
least amount of residue in your glass.

Mount it to your Bench

Silica Bronze V-Blade mounted to stand - $65.00
Silica Bronze V-Blade on Adjustable Stand - $85.00
This is the Highest Form of Necking !  
Round Blades can adjust to an exact width.
Always a new surface , so it leaves no residue.
Take it off it's stand , and it will slip into the Quick
Release Pocket of your Blast Shield.