Bought about three years ago on eeeeeebay, they held the adaptors and the buttons
Then they pushed the buttons in.
Ta-dah!
They made the job so quick and painless.
Sometimes the right tool really does help get the job done. Though I confess to breaking my twin needles about three weeks ago on all the topstitching. I still have to buy a new one to restart. At first the topstitching was fun, now it is dragging on, it's not quite so fun. There is just so much topstitching!