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Control all components in regular intervals of 1 – 3 months, depending on use, against possible damages and loose connections. ¦ Before use always check that all screws and plug-in connections and respective safety devices fit correctly. ¦ Damaged or worn parts must be replaced immediately and the apparatus is not to be used until restored. In case of need, exclusively Original KETTLER replacement parts should be used. ¦ The device is safety tested. ¦ Improper repair or constructional changes (d