I have a Palmer cue that I've owned for 43 years and there's no problems but there aren't any rings in its design. However, my Runde Schon is from 1985
and I've stored it in hard cue cases over the years and take it out to admire from time to time since I no longer play with the cue.......nary a problem of any kind
with the cue.....it still looks and feels like brand new.....totally smooth finish.
I have no way of knowing what caused your cue to lose it's shape but it seems logical that it one or two things or some combination of the two. The quality of
construction by the cue-maker is the most obvious...... what quality wood was used, how seasoned was it and how quickly was the cue build completed. The
other is environmental, i.e., cue storage. Even basements in many homes can exude moisture if the cue was stored there or anywhere with possible dampness.
Here's what I confirmed recently with two different cue-makers whom are making me a cue. The forearm & veneers are the first thing tackled in the manufacture
of the cue. This segment of the construction can happen quickly and early on in the total process. Then these veneers have to sit and dry for a very long time.
How long did you ask? Well, I really don't know but I doubt it's a coincidence that both cue-makers told me that the veneers had to sit for months before they can
work on the forearm. I'm talking 4-5 months sit time because even a well seasoned wood can slowly contract from any gradual but nonetheless slow loss of moisture.
At least that's my understanding of ta custom cue build process as it's been explained to me by four different cue-makers over the years.
Those are the two main reasons I can think of for your cue to develop problems with tis finish.
Matt B.