Note . Bent piston rod can be straightened using a monkey wrench and a vise . Works . A ' monkey wrench '??!? I would fire anyone working for me if I found a monkey wrench even IN their toolbox , much less if they attempted to use one . The tool colloquially known as a ' monkey wrench ' is used for making repairs on , most often involving that carrying natural gas . That would be some real quality wrenching or of the Bonneville Salt Flats variety where oldtimers have been known to recast a holed piston using the surface of the salt flats . Just don ' t wrench on anything I own . Just to illustrate the ' INadequacy ' of what you consider ' adequate ', years ago , Honda would not sell the parts necessary to repair the pressedtogether crankshaft on a twincylinder 160 cc motorcycle the connecting rod , bigend pin , the needle bearing , and the thrust washers because Honda didn ' t feel there was an American machine shop capable of using a hydraulic press to assemble a twincylinder crankshaft to H ' s standards . Even though Honda would sell the parts to repair a SINGLEcylinder 90 cc engine . which used the identical bigend pin , connecting rod , needle bearing and thrust washers . That engine you ' repaired ' with a ' monkey wrench ' that was good for what . 25 rpm , mebbe 50 ? Or was it used to construct a lamp ?