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I thought members might like to see my attempts to machine a 53kg bar of 400 series steel for a center pin for a hoist. The hoist will be used to lift diving equipment and other trial underwater equipment to a Dive Tank platform. The Dive Tank is 4.5 m high by 3.5 m diameter. Returning to the...

From most articles and posts I have read the usual material is Fire Cement and Perlite but I have also seen reference to a Plaster and Sand mix. My construction will uses 44 gal drum so the requirement quantity is quite large. Where I am located cement is about 1$ a Kg and Perlite is about...