who knows ZYX retipping or refurbish ?

Sorry I didn't explained very well. If I send it back to ZYX for repair, what do they do ? :       retipp ? exchange ? repair ?   some say they refurbich, some say they send you a new one. What is the truth ?

''Refurbishing'' by the manufacturer means removing the existing
 generator and putting a brand new generator instead. You get   a new cartridge in the existing body. ''Refurbishing'' by an retiper
may include cleaning the cart from small black particles, new suspension and new stylus or cantilever/stylus combo. ZYX has
unusual stylus mounting so stylus only retip is not probable.
This means , say, new boron cantilever + chosen stylus shape
but the price is + 500 euro. Cleaning and new suspension means
added costs. My advice: write to ''Expert stylus'' in UK and post
your cart to them after appointment. They will inspect your cart and inform you about their possibilities. You can then decide what you want to do.

andychris If I send it back to ZYX for repair, what do they do ?

No one can answer this question - including Zyx - until they examine the cartridge. In the case of Zyx, they offer no service at all when a cartridge has not been purchased through proper channels, so I would imagine that would be the first thing they would ascertain before conducting a thorough inspection.

In fact , nobody knows nothing about ZYX . My question seems to be simple, what ZYX does when you send them a used cartridge ? They repair it or give you a new one ?
 I'm not interesting in retip by other than ZYX. I don't need a zyx cartridge that doesn't sound like a ZYX cartridge.

@andychris 

If you will search audiogon you will find my detailed explanation how do they work with broken cartridges if you purchased them from authorized dealer (it's easy to check by serial number). 

1) They can ONLY give you a NEW cartridge and you will pay at least 60% of 100% retail price. You can also upgrade to the next model. At least in the USA it workd like that and you can still contact Mehran at sorasound The cartridge must be an original, it means you can not send them back a ZYX cartridge if somebody else tried to fix it. 

2) ZYX cartridge body is sealed, the original cantilever is way different from any other cantilevers on the market, check this picture of my ex Airy3. If you want to experiment with your broken cartridge you can send it to some other re-tippers, but it depends what you're gonna do (just replace the diamond or replace the whole cantilever). 

3) If you want to replace the cantilever someone will have to crack the cartridge body. Then you will get a cartridge which is no longer ZYX cartridge. 

4) The process via Nakatsuka-San is the best if you're ok with the price, you will get a brand new cartridge with new serial number. But i think you can source brand new cartridge somewhere else for lower price (maybe used or demo).