Ultegra FD pivot screw loosening
While prepping our tandem for a ride tomorrow, I noticed that the lower pivot screw on our Ultegra FD, the lower one that's attached to the FD housing, had backed out about 1/4". We would have been down to only 9 speeds. Oh, no! I've found this screw backed out several times on Ultegra (that all I have) FDs, but it never fell out. What to do to prevent that? I assume if it happens to me, it happens to many people. I've been nervous about adding thread locker because I don't want to gum up the working of it and am not sure how exactly to do it. Never had one apart, don't know the "do not do's."
Thanks.