This is a move so that the top colour of the knife can be changed while it is underneath the matchbox tray. Again it's self-operating but you must remember a few points. When the knife is under the tray you just push the tray to one side, however, it can only be pushed one way. The push must be made so that the side which the blade is nearest meets it. What happens is as soon as the side touches the blade the knife begins to lift and in doing so turns over. The movement must continue until sufficient space has been allowed for the roll to be complete. The handling is not all that important, however I have found that pushing it with one finger the tray tends to bob up and down so I suggest that you place the thumb on one long side and the second finger on the other side with the first finger resting lightly on top (see Fig 2).
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