Yes, I know. That was the starting point for Mike's work, and he suggests that it is a good model for a new study, using modern equipment and methods, including cleaning. But, there is certainly evidence of wear that he gleaned from more modern stylus shapes, using lower tracking forces. Interestingly, on the cleaning issue, I don't normally wet clean a record after each play. I clean it once, thoroughly, before playing and if it doesn't play well, will do repeated, multi-method cleanings until it plays well or I reject the copy as damaged or flawed. I doubt many people go through the rigors of a deep clean after each play, which is where this might lead if one wanted to minimize friction causing deposits on the record.