I am not that crazy about using lock-tite on a servo screw, just had a issue with a stripped screw and had to Dremel to get it loose, not very happy, so I went to the local hardware store and in their washer bins, I found what they called star washers, they have locking parts on both inside and outside with a 3mm inside hole, for me they work perfectly and yet to have them come loose, I also use them on my clutch bells when I have enough room for them.