I know this is late but if you can find the liquid carborundum in a tube sometimes called screw loose
it can work wonders. You put some of this liquid on the tip of the screw driver or in the screw head
and it increases the friction like 1000 times. It has been my best friend many times over the years.
It's just hard to find. I always buy a tube when I see it. Hardware store, lumber yard, places like that.
2007 R1200GS almost farkeled to perfection!