I had to replace the inner workings of my toilet. Everything went smoothly until we replaced the bolts at the bottom of the tank. The tank to bowl kit that we got gives instructions on placing the bolt, washer, gasket in the toilet tank, then a nut, gasket, washer and wing nut under the tank. The last instruction is DO NOT OVERTIGHTEN. We can't get either of them to stop dripping. I am terrified I will overtighten and break the tank. How do I know how tight is too tight? Help please. I can't afford a plummer.