From my own experience I do not recommend the article
The screws can't be adjusted that easily...this damaged my table The Edda
I consulted customer service to be able to return this defective item, but they did not help me... I lost my money and my stretcher. It was damaged. I am very sad and disappointed. because their products are super expensive and their customer service is bad
They should send the manual to do it or have an installation video. That could help new buyers. They never send a manual for their product. A manual is an ethic that guarantees how to handle the items. I hope my experience can be of help to others.