Joined: Feb 2012
Posts: 19,381
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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
Sorry if you commented of this question, I kind of lost the flow during trying to keep track of all your efforts.
In the beginning I wonder if you tried to remove the convex "washer" between the adaptor and the caliper. The amount of pad displacement on the rotor's sides looks to be close to the washer's thickness, I have seen more than one caliper mounting that used these ball and socket washers as only spacers, lacking the other half of the pair that make it a ball and socket.
I would also add that "BB5 based" doesn't mean much but that another company "borrowed" the general appearance of another's caliper. Not the dimensional specs or all the design elements. If this caliper is not made by Avid then it's like saying a Kia is Mercades based because they share the same roofline and 4 wheels. So is this an Avid caliper? Andy
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AndrewRStewart