Door Jam Switches?????

Ok Guys Im Desparate Now,what Do You Think About Using A Heli-coil On The Switches,im Stuck With A Set That I Bought On Line,cant Return Em Anyway So I Thought I Might Try Using Something Like A Helicoil,ted You Might Be Right About Someone Modifing The Hole In The Jamb,after Really Looking At Them,they Do Look Drilled Out.
Any Suggestions---bob