After realizing my bike has a blown head gasket, I started removing the head of my 04 rm-z 250. On the engine's left side I saw something that would make any one of us get that" heart sinking" feeling. The previous owner (one of em) had stripped out the two 6mm bolts that help mate the head and cylinder (not the 10mm head bolts). Not being able to get the OEM bolts in, he came up with an alternative, get a longer bolt of the same size/pitch and put a nut on the other end of the stripped hole. Torqued it to spec, and rode it. Now comes the "engineering" part. The general idea is that you don't want to stray from the manufactuer's design. Well, we all have gotten into situations that disagree with that statement:smirk:. The question is; "Can an alternate fastening system be made to create the same downward force required on the two surfaces to be mated?" After pulling out my statics book and crunching the numbers, you in fact can relocate the thread location, i.e. using a nut in place of tapped threads, without causing significant issues, and still meet the required OEM specs. As long as you use the original thread pitch and diameter, you may still torque the bolts to the OEM specs. Switching bolt diameter and pitch can be done, but you WILL have a different required torque to create the same required force acting on the two surfaces to be mated. Just thought I'd share my findings to hopefully help those out in a similar situation and possibly poke some engineers brains to also consider other factors such as required strengths, coefficients of static friction, alternative materials, etc.