What is the actual issue? Try to problem solve it.
First - do the screws thread into your grip correctly, or are they too small?
Second (if they fit) when you screw them into the frame, do they seem to bottom out before they actually get to press on the ASA?
If the screws are too long (as described above) You can buy smaller screws at your local hardware store (ace hardware..home depot, you name it) or cut them down with a file or hack saw and clean them up with a wire brush or whatever so the first thread is easy to start. When you go to the hardware store, bring your screw and find a nut that fits it, so you can be sure that the screw you buy has the exact same threading.