Hey Dano,
My first great custom cue was a Joss West that I bought in the late 70s and I played with it for 2 years until my Ivory joint cracked. I had it replace with a white implex joint at the time. I am not sure if Bill was using the phenolic sleeve trick in those days..
It is my opinion that ivory joints are and can be problematic and therefore I have banned them from my cues because I don't want them to be coming back for repair . Eliminate the pain in the ass factor with customer complaints downstream. If a customer wishes me to build a cue with an Ivory joint, I will do it but I inform them up front of the fact that I won't replace it for free down the road.
This last week I just finished inlaying a cue with over one hundred and twenty five ivory inlays and I made the deceision to go with Juma on the joint. I worried about this decision for over a week but in the final analysis I think I made the right move because I know the Juma will hold up and also look great.
Now that I have installed it and turned down the cue, it looks great and does not conflict with the color of the inlays on the cue.
I have seen many a cue with Hoppe rings in the butt that were cracked also and we has cue makers can not control how some store or travel with a cue in the field. I know my JW joint cracked because I played with it after it was in my car in the winter for only 45 minutes while I was having dinner before going to the pool room.
IMO, ivory is nice but not worth the risk for joints. For decor rings I think it is a little safer. When customers are informed they always understand and opt for non Ivory when I am up front with my declarations on the subject.
The funny thing I have noticed is that ivory ferrules seem to have less of a propensity to crack as i have installed a boat load of them as a repair guy without reoccurring problems. Maybe because it is smaller and therefore the structure is more efficient for some reason, who knows.
Just food for thought.
Rick