Local officers were at Morrisons Supermarket in Cheadle between 12am and 4pm on Wednesday, September 11.
They fitted anti-theft screws for vehicle's number plates free of charge.
PCSO Mark Bridgwood said: "It can be a frustrating experience for anyone who has their plates stolen, as replacing them and dealing with the consequences can be a particularly time consuming process.
"Many of those stolen are used to mask the identity of another vehicle during crimes such as make off offences from fuelling stations.
"Regular screws that are used to secure number plates can be taken off with a regular screw driver in a matter of seconds.
"The anti theft screws prevent number plates being stolen so easily as you need a special tool that garages have to remove them."