Part four of our investigation to track down the people involved in a 1960s/70s reel-to-reel tape recording. Yesterday, we uncovered a major clue, in the form of some names. One of the names was Steven Mainprize. A Google search led to a couple of possible matches, one of which was Stephen Mainprize, owner of Mainprize Upholstery. So today, I gave that Steven Mainprize a call, and this is what happened.