All sapphire embossing styli made by me will need a "BREAK-IN-PERIOD" of 5 minutes or less, you'll notice the surface noise will diminish afterwards.
I manufacture the only Embossing Sapphire Recording Styli made especially for recording polycarbonate and PETG record blanks.
Can be re-sharpened many times
Works very well on embossing MYSHANK black vinyl blanks too.
As shown with a magnification image of the stylus tip. This lathe embossing sapphire stylus is made with an 87 degrees angle, with the cutter head tilted back slightly will produce a standard 90 degrees groove.
Available for Westrex, Neumann, Audax, Grampion, Presto, RCA, and Rek-O-Kut cutter heads.