Dear Pim:
It was very great to meet you again and extended a very fruitful dialogue with you and Wittawat.
Regarding the testing for improving the inside fastener, we fail!
Very sorry to inform you this message.
I will ask Plern to return the part to you.
If there is any other idea comes to my mind, I will inform you immediately.
Wish you the best!
Regards,
JR Liang