on damper 12 mounted on one side of plate 22 in the center is a hex head member 26 having a hex nut shape on the outside and being hollowed out forming a socket 29 on the inside and exposed through an opening 28 in plate 22 as best seen in fig5 7 as noted earlier hex head member 26 is provided with a socket 29 on the inside which is large enough to accomodate hex nut 16 mounted on the end of crankshaft 14 without making contact with nut 16 hex head member 26 also has a neck 34 extending from the side having the entrance to socket 29 which is circular in cross section and having a diameter so that it can be inserted into opening 28 in mounting plate 22 when hex head member 26 is assembled with plate 22 so that neck 34 is inside of opening 28 then the two parts are welded together along the inside shown by bead 37 in fig2 referring to fig8 for a description of how tool 20 is used to rotate crankshaft 14 in engine 10 tool 20 is mounted on damper 12 mounting plate 22 is secured to damper 12 by aligning its holes 24 to threaded holes 18 and threading in machine screws 38 when this is accomplished it will be seen that nut 16 on the end of crankshaft 14 will.