| A progress report. Per the above comment, the tubes indeed become stepped over time. But I've been working with a rebuilder of hydraulic actuators for construction equipement, and there's no reason why the tube can't be honed smooth. The shaft can even be polished if it's damaged. So I see no obstacles in restoring them. Pressure is considerably less than an aircraft strut, or even an automotive brake line. I hope to have one rebuilt in the next few days, will keep you posted. |