While a well-chosen Magna-Tip bit is a wise way to mate the proper tool to the proper screw slot, a CLEAN slot is essential.
Before attempting any work on a century-old screw/pin, please take the time to thoroughly clean 100+ years of oil, grease and dirt from the slot! A common safety pin or push pin works well for this.
This way, the proper bit fits properly and to the BOTTOM of the slot for optimum interface and torque application.
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