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HOW TO SETUP AND USE THEHAND OPERATED ROCK CRUSHER: Therock crusheris shipped with thehandle screwedto the inside of the flywheel. This must be reversed. In the case of the double flywheel version there are two handles. The handle has two flats to accept a 24mm spanner right against the flywheel. Use a 24 spanner or a shifting spanner to hold it still.