You can contact him via PM here
or on his Aliexpress Store page. There are also a few active threads here where he reads and responds to questions from time to time. So you can ask him yourself.
Here is an example:
You can contact him via PM here
or on his Aliexpress Store page. There are also a few active threads here where he reads and responds to questions from time to time. So you can ask him yourself.
Here is an example: