A magnet sure won't do any harm but, If you are not replacing any gears, bearings, shafts, thrust washers, you won't have any more "break-in metal wear". The amount of metal from this point forward will be very minor unless there is a mechanical problem in the assemly.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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