Take the bolt to anywhere that will have a bench grinder. (most shops will have these, tire shops garages etc.) and just grind it down about 1-2 mm. That's what I did when I replaced my gasket the first time. Now I run ARP's but that worked very well for me, and they shouldn't charge you a dime. No need to go to a machiene shop for sure. Does your dad or one of your boys have a grinder or hell even a dremmel?