Using game Classes in my mod.

[Mastess]

Im trying to modify falx blades to can skin animals. Im creating an example item as both tool: "knife" and class: "ItemKnife". i cant reference itemknife class and simply making tool type a knife dont work. I dont have a proper code so i cant show you here but you understood my problem. Please help. Oh also i tried to add ItemKnife class myself from github repo but eventhandlingharvestable reference cant be found ? some help please.