Iuse lock tight. There are two formulas a blue and a red colored one. I forget now which one I have out in the shop now. But if you use that you are not going to get them back out. Which is why a lot of people do not like to use it. Another thing you can use is clear women's finger nail polish. Paint the screws and put them in. When it hardens they are there for good. If you ever want them out, you can take some mineral spirits and that will help to remove the screws again.