Maniac is not the guy with this machine first of all, I am ... secondly, I guess you still didn't read what I wrote specifically on this point. I use plastic clear hose .. (tubing) slide it over the shaft after you remove the tip. Then, secure it from sliding by simply using some painters tape on the end of the hose.
The hose acts as a collet ... the wheels NEVER touch the shaft ... the hose does not rotate and there is zero chance of harming the shaft. Your concern is a non issue if the person using the machine has half a brain to take common sense precautions.
There is always a chance of screwing up a shaft no matter what is used.
And the machine you are using has a lot of angry customers.
There is no reason to be sarcastic , Its not my fault that so many people have had issues with the same machine.
I am only repeating what I have read from the cue makers section.
And I am not willing to jump in the sand box and argue about how anyone replaces a tip.
MMike