The pulley wheels on rope operated extension ladders are usually made of nylon and can be damaged by contact with mineral oil. In a detailed visual inspection you check to make sure that these wheels are free to rotate but if they need re lubrication you should always seek the manufacturer's guidance first.
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Are you confident that you know when a ladder is too damaged to use safely? http://t.co/pkTZJTco
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RT @ladderstore: Loft Ladders: What do I measure and how do I know they will fit?: Buying a loft ladder makes access to the extra... htt ...
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RT @ladderstore: Safe Ladder User Whatever the Weather: An article about safe ladder use in difficult weather conditions such as ... htt ...

