Your English is better than many people in Canada.
I am familiar with Kessler (used in our DMG macines). I also find that their prices are extremely high. I have disassembled one spindle for bearing replacement, and the spindle repair company that I use also repaired one for me. Let me say this, these spindles are badly designed. For the money they want, it's robbery. They claim that 18000-r is possible. It is, but for less than 5 minutes, then overheat. I know of a place here in the Toronto area that can rebuild them, but he doesn't like them. If you want, I can give you the name, but I don't think it makes sense to send the spindle over seas to repair.
Good luck in your search