Part III: Slot Machine Cheating · Physical Cheating Methods · #5.6
Coin Spinning (Plastic Wire Method)
How it works
A clever variation on the yo-yo technique where the cheat attaches a short length of plastic wire to a coin and spins it as it enters the machine. The weight and size of the coin are accepted by the machine, granting credits. However, the spin created by the plastic wire causes the coin to exit through the reject chute into the payout tray rather than dropping into the machine’s coin storage. The cheat can then retrieve the coin from the payout tray and reuse it indefinitely.
Where it appears
Mechanical slot machines with separate credit sensors and coin storage paths.
On the record
This technique was documented as a specific vulnerability of early mechanical acceptors and was referenced in Wikipedia’s slot machine fraud section as a “particular scam” that became obsolete due to newer machine improvements.
Detection & prevention
The paid halfHow a monitoring room catches coin spinning (plastic wire method), and what stops it recurring — written for the desk, not the reader.
Detection · 27 words
Prevention · 26 words
Published as a detection reference for surveillance, compliance and gaming-operations professionals. Thresholds and tuning are set by the property. Nothing here is instruction — the method is described so it can be recognised.