The lower portion of the tap guide should remain as square as possible to the engine surface. Turn the tap slowly while making sure the guide remains flush. TAP GUIDES INSURE THAT THREADS ARE SQUARE TO SURFACE.
Tap Handle Tool Level, Tap and Die Handle Level, Tap Guide, Tapping by Hand, ...
Time-Sert 37164 7/16-14 Tap Guide
JOES Racing Products 28601 Drill & Tap Guide Kit
Time-Sert 30155 M10 x 1.5 Tap Guide
Time-Sert 36105 M6 x 1.0 Tap Guide
Time-Sert 38125 Tap Guide M8 x 1.25
