How to change the strap attachment
_ remove the binding from the board,
_ turn the binding to remove the old strap fitting from underneath,
_ when it gets stiff, go ahead and force it,
_ put the new strap in its place, pushing it in from below and pulling it on top to get past the point where it gets stiff.
If you have several strap fittings to replace, complete one binding properly then the other so that you always have one to follow and know where each strap goes.