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Editing Step 3 —

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Carefully place the carriage top side down, so that you can see the groove which normally runs along the rail. You will notice that each side has small ball bearings behind a thin spring clip.

Using a lint-free paper towel, carefully wipe away any dust or debris from the groove, do not touch the ball bearings as you can cause them to become dislodged from their holder and you would need to reinsert them.

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