339K views · 1.6K reactions | Ian Sandusky using Walter Tools notching / grooving tool to add these angled profiles to this 303 stainless steel! These are bushings that will assemble with a bolt, and a pair of set screws will interface with those angled notches to provide an invisible fastening system for a high-visibility aluminum component assembly we’re currently running in the mill! | Practical Machinist | Facebook