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We used loctite in the Air Force while working on fighter aircraft. Even the little screws had a drop of it to secure it. Not that big of a deal for a secure screw setting. Use a paperclip, or toothpick to apply a "tiny" amount to the thread's only. Remember the male, and female parts are almost perfectly opposite, so you don't need to dip the screw in it. Keep it off the shank, head, and tip. Insert the screw easily so the loctite doesn't cake the inside of the link where the flat shank touches. Seat the screw, and it will be fine. As for the proper grade to use, I don't know. We have a regular tube of it at the shop. No need for too much.
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