Late Gothic Crossbows and Accouterments

[Andi]

Here you will find some macro photos of a crossbow nut found in the Schlossstraße in Hamburg-Harburg.

I am wondering about the substance which can be seen on the middle of the nuts notch. It seems to be metallic, possible lead or tin? Has anyone an idea of its purpose? I was also not able jet to take the dimensions and have to ask the exavators of the object.