This is a simple to use tool that can help you resize most bracelets.
It is simply a holder with a good grip. On one end there is a point that you can use to push through split-pens and pen+collar pens. On the other side there is a “fork” that can be used for push pins with “shoulders”. This fork is a smal size that you can use with solid end pieces..
The one that is standard included on this tool is not of the best quality, not so well crafted and not so tough. With a few uses, you might notice that .
On the picture there is also the Bergeon 6767-AF fork that you can use to replace the fork on the tool. This is much better crafted and is made of tougher steel.
You can also take the Bergeon 6767-BF pin, which is longer and stronger than the pin that is on the tool (0,8mm thin).
And you might also have use for a standard size Bergeon fork (6767S), not to be used for solid end links, but very good to use on leather, rubber, canvas straps, where you need to have some leverage to move the shoulders of the push pins in.
You should see the bracelet tool as a base tool, you can replace the parts on both ends with tools of better quality. There are better forks in different sizes, and there are also better pins in a few sizes and even lengths. So keep the middle part end put good tools on it in the future. For a few uses, the tools that are on it will work fine. The width of the Bergeon parts is 3mm, I do not know the speed of the thread.