(I'm familiar with thread "locking" compounds, purple, blue, and red, but that's not what I'm looking for here. They lock once and then upon breaking the joint, do nothing further.)
I'm looking for a way to tighten up a free spinning clean, easily threading bolt in a threaded hole. Basically I want it to behave as if there is a locking fastener like a "nyloc nut" or an "interfering thread nut" etc.
Any thoughts? The best idea I have right now is sugary syrup or something.
EDIT: to clarify with some examples
Example 1: I have a metal pen, with a threaded metal cap that screws on. The cap screws on like butter, very nice and clean threads. The problem is sometimes I find it has unscrewed in my pocket. I would like the threaded connection to always feel like it has a slight interference fit.
Example 2: I have a folding pocketknife with a single small torx screw that adjusts the tension required to fold out the blade. This screw loosens occasionally and then knife doesn't work properly. Common wisdom is to use blue threadlocker and tighten the screw to the perfect torque. However, I'd like to adjust it frequently without disassembling the whole thing and adding more threadlocker.
Best Answer
Based on the clarifications, I would recommend using a reusable thread-locking liquid.
Here is a link to one I found that may work. I have not used it. Vibra-Tite VC3 Threadmate http://www.vibra-tite.com (I am in no way affiliated with the Vibra-Tite Company)