‘Grand Slam Guitars’ fills Cooperstown Main Street storefront By Ted Potrikus Along with the book shop still there today, 139 Main Street in Cooperstown has seen a wide variety of occupants over its history. In its time, the impressive storefront has housed a car dealership, an auto garage, gift shops, a stereo and record store and now, after more than a year with its lights out, is home once again to retail with the opening of Grand Slam Guitars. Guitarist…