WS 18: A simple DIY Leather Strap
Here is the punch in a closer view. You can clearly see that round tip. When you hold it on top of the little tube of the part right on the aluminium disk, it will roll that tube back (a bit like a pullover sleeve rolled up) and then look the lower and the upper button part. The disk is actually only really used for the upper part of the button, the one with the star shape.
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