Translation?

[sharps4590]

On the bottom of a Funk drilling, "Kugelspanner"

I'm pretty sure "kugel" is "ball" or, translator brings it back as "sphere", which is understandable. However, "spanner" comes back "peeping Tom." That one I don't get.....

[Axel E]

Kugelspanner = bullet cocker or rifle cocker. Funk's own name for a rifle barrel lock cocked separete, independent of the shot barrel locks, In modern German parlance: Separate Kugelspannung.

[sharps4590]

Thank you, Axel. I am grateful.