I did a much easier fix. I took 2 metal straps about 1 1/2 inch wide, drilled a hole in each end. Took 2 carriage bolts & welded 1 in each end of one strap. Located the spot under the rack where the second strap would contact the metal outer edges of the rack & drill two holes from the underside of the top case that lined up with the holes in the strap. I then put the strap with the bolts in from the inside of the top case (bolts exiting the top case to the bottom) & installed lower strap. The only draw back is the strap had to be removed to remove the top case. This winter I may built a bracket like you did. It looks like a much better fix.
Yup! I'm sure there many ways to fix it and I entertained several ideas including your solution before beginning the fab. My goals were to not change how the top case was removed, make the fix look like it belonged on the bike and eliminate at least 90% of the wobble. I think I exceeded my expectations because I'd say that at least 98% of the wobble is gone and I'm very happy with how it looks. The correct solution would have been for BMW to design it right from the beginning. With a cast Aluminum rack and some properly placed support pads on the bottom of the Top Case there would be no problem to fix. Maybe in 2013 or 2014 BMW will get the message and fix it? Hopefully it would be retrofitable fix? I seriously ragged on BMW about this issue in the K1600GTL owners survey they sent me several months ago. We'll see if anyone was listening?
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