ebay number 251216349010 Can any body tell me what this tool is used for? ................CORVAIR HARMONIC BALANCER-PART #(3880971). FROM THE INFO THAT I COULD FIND,IT IS SPECIFICALLY MADE FOR 1964-66 CORVAIR W/ SPEC H.P.TURBO AND 1968-69 CORVAIR(exc.4/1BC).THIS IS A VERY RARE AND CORRECT ORIGINALGM PART IN THE ORIGINAL BOX............... MIKE KOVACS