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Engine cylinder protectors mentioned in Clymer manual

gregb6718

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I was thinking about winterizing and read in the Clymer manual about some Engine Cylinder Protectors that screw into the spark plug holes. A Google search didn't turn up anything like that. Clymer book refers to the Brookston Co. in Peterborough NH. Could that be a typo and they meant Brookstone? They seem to be out-of-business. Thanks for any information.
 
Years old info, company likely dead.

Engine fogging oil like boats use will work but dirties the plugs up.

Thought that might be the case. thanks, amc49. I see Ft. Worth is going to be a pleasant 62 degrees tonight. East Tennessee is predicted to be a frosty 38!
 
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