Fixes for known quality issues
Keyboard Fix
Many have claimed that the 8500/8600/D800/M60 have too much flex in the keyboard. For instance press down on the left and right shift button, the left arrow button, the esc button or the buttons surrounging the erasehead. If there is movement after the key is depressed (if you press harder) then you have flex in your keyboard. There is a simple fix for this, which would make your keyboard much more solid regardless if you previously had noticable "flexing" in your keyboard.
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Removal of excess "play" in trackstick buttons
Many have complained of excess "play," or distance the button has to be pushed down, in the eraserhead buttons. This is a simple explaination of how to fix this.
In the mod i used 3 mm washers which are less than 1mm in thickness, but the ones in the picture are actually 5mm washers. the width does not matter as long as they're about 3-5 mm. it's the thickness that matters. make sure the washers are slightly less than 1mm in thickness.
Another idea that was posed was to use the foil found on tylenol packages. then fold the foil and epoxy/superglue it to the button. Pictures of how this was done is linked
here. This is provided by bache.