I've only ever purchased through eBay, and I will just send him a message with some pictures of the issue. I have only requested action from him twice regarding parts, and he/his team responded in a day or two. Pictures are the important part, I fear the translation tools may not always translate technical words correct and pictures skip any losses from it. I worked for a valve manufacturer who had a plant in China. The guys I was communicating with were very smart, but neither of us could properly communicate technically. Drawings and pictures cut right through the fog, we all understand when we see it.