hey everybody, , my IHP's right side screw hole , is worn out due to over tightening of the screws i guess

, the little curved washer just below the wood has actually made the hole on the wood bigger & deeper

, the screw falls and the rifle makes a squeaky noise every time i try to cock the rifle

, but i tried to search a nut for screw in the hardware stores near by

, and failed to find a nut of the same size, here is a pic to give you guys an idea of whats going on ...
http://s383.photobucket.com/albums/oo27 ... 081305.jpg
any suggestions for a permanent fix

?