At one time, the only Nzonic clone was made by EhPro - if you have one of them (congrats, they're an excellent tele-mech)... the thread is right hand, and as I recall from the first day of ownership, fairly tight. If there are others making them now, then below may not be useful advice.
The minor trick is - If you hold the knurled contact with pliers, small enough to fit down into and between the button housing, then press firmly on the button while turning the pliers... you should be able to break the thread loose.
Spinning the lock ring down may aid in holding the button, but doing so will make it more difficult to get a good plier grip on the contact.
Hell, for all I know, they're loc-tite'ing them these days (which would be odd, because being able to take them apart for cleaning/inspection is a function of ownership)... so if the first method (alone) doesn't work, use a heat gun if you have one, to loosen the loc-tite, or a small torch, if you can be fairly careful about it. ;-)