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Ask the math problems in "one lesson and one practice" in the sixth grade.
There are five parts divided into 2:2: 1 3 heap. Stack the two on the balance and weigh them.

Situation 1: Equilibrium. Needless to say, the last pile is genuine.

Case 2: Lift or sink one end, and take out two parts from the tray for the second measurement. Put one aside.

Situation 1: If you take the parts out of the hoisted tray, then the parts in the hoisted tray are genuine!

Case 2: If the parts are taken out from the sinking balance, then the sinking tray is genuine.

I hope you understand.