Loctite 222. Threadlocker that allows the adjustment of screws including countersunk head screws and set screws.
Good on low-strength metals which could fracture during disassembly, e.g. aluminum or brass.
The product works on all metals, including passive substrates such as stainless steel, aluminum and plated surfaces. Tolerant of minor contamination due to industrial oils, e.g. motor oils, corrosion prevention oils and cutting fluids.