real question
Is why is your ferrule scratch up?
I dont know what you are doing wrong but if your ferrule is getting scratch up. You are doing somthing that isnt right.
allot of ferrule wear is from,
You are replacing the tip without a lathe
When you sand the side of the tip you are also sanding the ferrule.
When you are chalking up you are rubbing the side of the ferrule with the cube of chalk . After a while your ferrule will have a hour glass shape.
Problem is on a predator shaft the ferrule is thin so you dont have much room to screw it up.
last problem is the ferrule is special and not all cue repairman carry all the special ferrules in stock.
Like to edit this in.
If your cue repairman is not up to speed on repairing predator shafts, dont let him touch it.
Send it back to predator.
Most all of the new Ld shafts take a special ferrule. And I am sorry to say but some of these Ld shafts are a disaster waiting for the first person that tries to repair it.
MMike