isnt mending moss from Tinkers?
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You are thinking ball of moss from Tinkers.. and IIRC it was nerfed in 1.10
But if you are still playing 1.7 mods, add a modifier, and put a RF battery on it to make it "electric" and recharge it. This was my go to method of repairing Tinkers Tools in 1.7.4 Infinity