Hi George,
This is for the 1.20.1 Version ;)

i have a proposal for your HammerItem & WireCuttersItem Classes.

You don't need to set : .stacksTo(1) in the properties because durability items are always not stackable.
And i can make a addition for the KubeJS Diesel Generators Addon so that users can create custom Hammer and Wire Cutters with custom durability.

But with this properties set it isn't possible.

sure, I don't know why I did this this way