Joined: Nov 2006
Posts: 19,810
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From: NJ, NYC, LI
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
To safely shim a 7/8" quill to fit in a 1" steerer, I would make a two-piece shim, each a piece of 1/16" aluminum curved into a half cylinder. The sliding wedge of the stem should push them apart, separately from one another, making a secure fit.
In bending 1/16" aluminum into a curve, its actual thickness may change a bit, so will need to be cleaned up with a flat file before it'll fit perfectly.
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