Tell you what I did... went to a shop that sells real rubber bumpers, half round with no hole in the center, drilled an indentation on the back so it fit over those horrible plastic feet, epoxied them on. Solved... looks better, doesn't slide. IDK why they put slippery plastic feet on instead of rubber...
I can answer that. When I created the Instroke case I had two cases to use as guides, my Porper with tapered cavities and my J.E.F Q Case with unpadded tubes.
The Porper had no protection on the bottom and the cues would eventually poke holes in that type of case so I knew I had to protect the bottom somehow.
The J.E.F. Q Case had small metal buttons/tacks on it and didn't really protect the bottom from the floor very much. The bottoms would get all ratty and scuffed.
So, my first cases had big metal tacks on them pretty much covering the bottom with metal disks.
But then when I went to mass production of the Cowboy style case I was working in the prototyping department at the factory we chose to deal with and they showed me the plastic feet and how they were used on a variety of leather goods including briefcases.
So I felt pretty good about them and though they lifted the case enough off the floor to protect the bottom better than the studs we had been using. Case slippage was not something I even thought about at that time.
Later I did entertain the idea of switching to rubber feet but I couldn't find suitable ones and the cost of having them made was not something my partners wanted to consider. As a small manufacturer we often don't have the volume to justify the making of custom parts.
For example we used barbed nails, a certain type that is nearly impossible to find. When we finally ran out we searched and searched for a company that would produced them in quantities of less than 500,000 per color. We found one. Now we buy nails at 20,000 per color
You can do the math on how many cases we have to produce to use them up.
As someone pointed out there are many ways to modify these cases to have a non-slip bottom. Let me tell you a secret, contact cement is your friend IF you follow the instructions exactly. It bonds so well that it's practically impossible to remove without ripping the leather off.
I don't like to depend only on glue though so wherever possible I will glue and nail/sew/rivet to add another layer of durability.
