the thread is probably clogged full of crap glue residue.. never use glue in areas like that, and always follow the instructions.. always - they are there for a reason.
take them apart, spray the lot with motorspray, leave it for a few minutes and make sure everything is dry. clean the grub screw up - better yet, use a new one! apply threadlock, screw in and leave for as long as possible before running the car again.
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