Thanks for the input, Sailor. Attached are 3 photos I tried and failed to edit. The left side (from rider perspective) mounting post is intact, with the "lever" properly in place. The broken right side is shown, with the lever absent. I'm looking for a way to repair the post so it will hold the lever securely. Could such a small piece be welded back on? Could a vertical hole be drilled to insert a pin of some kind to reinforce the broken part of the post? Trying to avoid an expensive new bracket. Thanks.
Thanks for the photos, although I wished the 1st one was more "in focus" to see type of metal / casting. It appear to be the same bad / weak casting design as we have on K1200RS - similar design as your K1200GT although the screen adjustment is manual for 2 positions only.
As written by "H96669" in previous post, a similar part holding the 2 small lower arms has always been weak and will also break fairly easily on K1200RS (2nd gen only from 2001). In your case, the usage of a large after-market screen replacement is making a weak design even worse (more torsion and more wind pressure).
I see 3 options:
1) Fix it as described above by H96669. Hopefully you still have the small missing broken piece, otherwise put a large washer on that side and a nut on the other (with Loctite or self-locking nut). Given your large screen , this is a crap shoot to see if it will hold long term.
2) Remove the lower bar holding these 2 arms from fairing bracket and try to have it welded. Assuming it is the same bad alloy / casting as we have on K1200RS, then you will be told by most welder: "forget about it !"
3) In parts fiche , I see one part in diagram that is VERY SPECIFIC only for these K1200GT (2003-2005) windscreen mount that appear to be the one broken (going across to hold both small arms). It is only $US$ 74 and might be the one you need IF-AND-ONLY-IF your dealer will not kill you when it shows up - in case it is not the part we think it is... no photos available just a bad drawing:
BMW part number: 46 63 7 670 508 (item 18 in drawing)
There is similar part on K1200RS that I have removed before, however the design on you K1200GT is different (and so is the part number) because of the connection to electric windshield motor.
Good luck !
Let us know how it goes...