Hiya trog,
I address them like this;
Returns Department
Cixi E-CIG Technology Inc. Ltd.
No. 145 Danshan N. Rd.
2nd Fl. High-Tech Building
Cixi Zhejiang 315300
China
Phone +86-574-6303 6932
So there are no problems with suggestions of breakages during the return post, I wrap the bits in bubble wrap and post them in a bubble bag.
I also include a note saying which part came from which order and when I received them, plus letting them know the parts had already been replaced with order number xxxxx
It's worked every time for me so far. As I have also said I arrange with the online help to have the replacement parts shipped out with a current order. I add a list of please replace in the comments section of the order, keep it brief it doesn't take to many lines of text before it's full. I also detail exactly what I need replaced, from each previous order to the online help person. That way I'm covering all the bases.
So that's
1. place an order equal to or for 10 packs of carts
2. add in the comments section of the order what you need replaced and from what previous order number you got it.
3. when you've got the new order number, contact online help and tell them you've placed order number xxxxx and requested replacements and give them a detailed list, more detailed than in the comments.
4. pack and post the parts back to them.
5. enjoy the new parts in 5-10 days time
6. repeat from step 1. as required