Check this link that describes the methodology and products to repair stripped
Footstrap screw inserts:
Scroll down to the bottom of the page and there's info on how to repair your
Also, try to find some of the '09 footstrap screws which are 32 mm long vs the
28 mm used on earlier boards.
Over the years, the "stack up" of the K-9 anti twist plates, tooth washers etc, used up too much of the screw length, so the longer screws are now provided with new boards.