As I wrote before I think that screws are too short, when you take how
thich are footstraps and K9 inserts and how much is padding (5mm) on the
board deck and material where screw catch material and starts to make trhread
from my experiance it looks to me that SCREW CATCH ONLY 4-5mm into the board!
Is this enought for your R&D to witstand force that it is on this straps.