The square discs may be stamped into endbells for square shaped
motors, like DC motors and servos and such.

Or potentially into the motor wire box for the smalelr ones...
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Regards,
Joe Agro, Jr.
(800) 871-5022
01.908.542.0244
Automatic / Pneumatic Drills: http://www.AutoDrill.com
Multiple Spindle Drills: http://www.Multi-Drill.com
Production Tapping: http://Production-Tapping-Equipment.com/
Flagship Site: http://www.Drill-N-Tap.com
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V8013-R