Metal Block
Usually built of steel plates and fittings, their shells have a binding which supplies the strength but the cheeks are of light plating. Some types have their shells cast in one piece. Where possible metal blocks should be used when using wire rope. (Built-up metal blocks which were the main type of block used by the RN for awning tackles make ideal heel tackles for rigging evolutions).A light application of grease should be used on the moving parts. Steel blocks showing signs of rusting should be wire scrubbed, treated with a rust inhibitor and lightly greased. A coating of linseed oil will prevent rust on the shell. Galvanised metal blocks generally require less maintenance, a light oiling normally only required. The pin which is of steel should be given a light coat of grease or oil. Wire brushes should not be used on galvanised metal blocks as this may damage or remove the coating, instead a nylon pad may be used to remove any corrosion.
