those old ali frames were glued with an epoxy resin. Over time, the epoxy decays and rots. Simply glue it back with another suitable epoxy compound. Don't ask me which one though, I have no idea.
@Mc_Nebula started
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those old ali frames were glued with an epoxy resin. Over time, the epoxy decays and rots. Simply glue it back with another suitable epoxy compound. Don't ask me which one though, I have no idea.