SAPPER ADCP -- BUSHING PROBLEM / FAIL Failure to lubricate the drop hammer rod properly caused the first bushing break not long after getting the new machine. We chalked it up to a learning curve error. Afterwards the BUSHING FAILURE were something of a mystery ... until now! While a super tight set screw puts stress on bushing anything less allows unit vibration to induce motion. Either way a relatively quick failure occurs. TRY LOCTITE or use a large rubber band or two as a stopper. BEST FIX :

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