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Location: Rochester, NY
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Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
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One could secure the fork's steerer onto a Vee block and placing that on a machinist's flat surface use an indicator to sweep the race seat. Do know that if you were to want to cut the seat with a tool the chrome will need to be removed from the to be cut surfaces, or don't expect a shop to offer to do this.
Just as common is the head tube end faces not being square to the axis and bent steerers will create the same "tight yet loose" headset adjustment that results from miss aligned bearing surfaces. Andy
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AndrewRStewart