My cargo van (Ford E-250 2007, in case it matters) has the brackets of the stabilizer bar (let me abbreviate with "sb") directly bolted to the frame. I have to change the bushings of the sb, and that requires me to take those bolts out. What scares me is that there's no nut in this joint; the thread where the bolt goes is made directly in the frame. So, if I mess up with that thread, I'm messing up with nothing less than the whole vehicle's frame. In this concern, all the service manual specifies is the torque to apply when fastening, and to not reuse the bolts (without specifying the grade of the replacement bolts). I'm afraid that there are several other parts that are bolted directly to the frame, like the exhaust and the fuel tank.
Hence, my question is: what can I do every time I loosen and tighten bolts to better preserve the threads on the frame?