Hi Craig: My thinking is this: hide glue is for a wood-to wood fit only and not wood to metal, plastic, ivory or phenolic (unless it is threaded).. If older cues are failing in their joints it is probably because of: A. the above, B. repeated shock and C. a poor fit on the joinery. I do not use hide glue myself as the epoxies, urethanes and CA's are very strong, easy to use and do not require a fit as precise as a hide glue joint would. My contention was, and is, hide glues have been around for centuries and hold together some of the most priceless wood treasures we have. I would not be afraid to use hide glue in a cue on a properly fitted wood-to wood joint. If it lasted as long as some of the pre epoxy, urethane and CA cues have I would be happy. As I stated in my previous post hide glues, of all the glues (as far as I know), mostly resemble wood and expand and contract at about the same rate. As a side note: when I visited the Martin Guitar factory awhile back they were still using hide glue.
Respectfully,