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Those levers look most excellent.
They are a Shimano model have not worked with (probably too new
).
Another extension lever which is better than DiaCompe for ridgidity (although I'm sure not so nice as this) is the CLB with its triangular cross section.
Mrs. non-fixie sure is fortunate so have such a terrific cycle mechanic right under her own roof!
All best to
La Triumverata. 
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