I will tell you more about that later.
Now, I just wanted to share a nice tutorial on inserting a twist lock.
I found it on the "you sew, girl" blog from Nicole Mallalieu.
Here is the link.
You get this result:
The twist lock button is easy to insert.
The twist lock front plate is more difficult.
You have to cut very carefully and be patient to get a smooth cut edge.
The tutorial is clear and easy to follow.
It now belongs to my star tutorials.