torque wrench and piston question

Thanks for all the great comments, So in the end.......Since I have not kept my torque wrench at zero when not in use. I am going to get a "quality" built wrench and take care of it like my engines life depended on it. (since it does) :) More importantly, I will pay close attention to "how" the bolts thread into the the parts. Thanks again for all the great comments.