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@gbj_tester
The Hooker is a linkage brake, like a Campag Delta (different linkage, but similar principle) whereas the TriRig is a roller-cam like the Shimano BR-7300. It's even smaller than the Hooker
http://www.tririg.com/articles/2012_03_Omega_Final_Prototype/650/2012_03_Omega_Final_Prototype_4.jpg