I don't know if this has been posted here at some time, but since I just ordered the billet tour pack hinges tonight, it got me to thinking about the very first mod I did to my bike.
We all know that the hinges on the tour packs are not real sturdy. The first thing I did the day I brought my bike home was unscrew one end of the tour pack lid support cable, tied a knot in one end of the cable, and put it back together. That shortens the cable just slightly and stops the tour pack lid just short of putting all the weight on the hinges.
This is probably the quickest and easiest modification I can think of and it sure will save you the grief of your tour pack cracking at the hinge. I've seen that on way too many bikes and I don't think I will ever have to worry about that problem now.
I tied mine at the top end (where it mounts to the lid) as it seemed to be hidden better there, and unscrewed the end mounted to the base of the tour pack so you can pull the knot through easier. The knot will tighten up a little more with some use, but thus far, I have not seen a need for a second knot.