I ran some tests on quite a few of my SM's, including 15-91's, 201's, FW's, a couple Kenmore's, etc, using a phototachometer. My 201 wasn't nearly the fastest. It didn't feel like there was any significant drag. My 1934 FW was nearly the fastest, which totally surprised me. My 2nd 201 is awaiting brushes, which are worn down to nearly nothing.[ATTACH=CONFIG]467090[/ATTACH]