Now that Eisen was done with one of the important mechanism of this rather unique weapon, the old man started to work on the next. And that mechanism was related to the actual blades. Technically, there were two mechanisms that Eisen had to work on for the blades, but one of them was just related to making it that they could be interlocked with each other to turn into one slightly bulkier blade.
In the end, that wasn't really an issue in the slightest, considering that all that Eisen had to do for that was shape the blades and handles in specific ways and add a few extra enchantments to keep them together safely. It should be relatively easy to hide those enchantments as well, though. Eisen didn't really need to think about that part of everything anymore, since this wouldn't be the first time that he made something like this.