Joined: Feb 2012
Posts: 19,353
Likes: 5,471
From: Rochester, NY
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
After completing the cycle of readjusting and tightening the headset and stem remove the top cap and measure down to the end of the steerer. Record and reinstall the cap. Ride the bike till the loosening reoccurs. Remove the cap and remeasure, any change in dimension? Also placing a small paint dot at the edge of the stem and the steerer will be a tell all if the stem moved WRT the steerer. I assume you've applied assembly paste. Andy
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AndrewRStewart