who knows ZYX retipping or refurbish ?

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). 

chakster, 'the original cantilever is way different from any other cantilever...'' This description is not correct . As I mentioned the ''stylus mounting'' is different as can be seen on your picture.              My Airy 3 is retiped by Axel with an boron/ Shibata combo while
an new ''rubber donut''( aka suspension) is also provided by                drilling an hole at one side of the body. One of the 3 screws on the generator must be loosened in order to get the generator out for
this purpose. I ever started an thread about ''irreparable carts'' and     assumed as such ''sealed plastic  bodies'' as by Sony XL series and
ZYX.   Anyway  an retip with a new cantilever/stylus combo should
be possible . BTW according to Axel his Shibata   is beter stylus
than ZYX original. 

@ nandric
How your retyped airy 3sound comparing to the original.
Thanks