[Ed. Here’s another great Bo-era story from the mind of Dr. Sap.]  Guest Post by Steve “Dr. Sap” Sapardanis After Bo Schembechler left U-M to become the president of the Detroit Tigers he met Oakland A’s owner Charlie Finley.  Finley liked to dabble in the unique as he was the inventor of the high visibility yellow baseball as well as the green and gold tunics the A’s wore in the ‘70s. The two talked about Finley’s new football invention – the reverse dimple football.  Its enhanced grip was supposed to improve the accuracy of throws and increase the distance it was kicked. [more on the patent here.] The grip enhancement looked much like a golf ball’s surface and the leather looked something like this: Bo was intrigued and told Finley to go see U-M equipment manager Jon Falk in Ann Arbor…and that’s exactly what he did in the spring of 1990.  The two hit it off and Falk agreed to try the new ball that Rawlings now dubbed the “Double Grip Football” with the 1990 Wolverines. Everybody liked it.  The quarterbacks liked the grip and felt more accurate throwing it.  The receivers liked the tackiness and the kickers felt it sailed longer when booted.  Falk wanted to use the new pigskin against  Notre Dame to start the 1990 season, but…