Tapered rod (manual punch) slightly increase the diameter of the splitting of a button.

Gradually increasing force. Slightly increased diameter, tried to fasten, if rigid fixation continue the process.

Reduce the inner diameter of the button

So without much effort, continues.
 

To increase the rigidity of the fixation button slightly flatten the lower part of the button. A little squeeze of her pliers.

Note:

In addition to the classical Pronged Snap Fastentrs with Ruseckas available buttons combined.

They are similar to button No. 61 are Ring Shring/
To reduce fixation using file or small file, slightly optochin the circumference of the lower part of the button.

To increase fixation using pliers, slightly squeeze the lower part of the button.