Don’t do what I did! Important note!
You dont actually have to extract the screws holding the motors on to do the soldering……
I basically wrecked all the holes in all the arms just trying to get the stripped Allen heads screws out, used plenty of thread locker of course, so after using, superglue, a Dremel with grinding stones and diamond bits, drill bits, extractors etc. etc I got one set out, then only to notice that you can just take a bearing out to get access to the board to make the solder bridge 
.
Now to see if it holds together after I reassemble everything, AND to see if my horrible soldered ground bridge works.
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