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For tube bases, believe it or not but I had Elmers white glue recommended to me by someone that was in a radio/ham club and it was their glue of choice. I have tried it and once set up it stays secure. Opinions will vary but there are some good choices including silicones. I think what's key here is making sure that something adheres and flows well to the original (hard) glue that's already there and (re)bonding.
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