"That doesn't make any..." She trails off, trying a few more spells, but the magic doesn't have a wand trace. No identifying residue; just plain magic.

Finally, she straightens up. "Well, mate," Tonks sighs, "Dunno what to tell you. Think this model's pretty well bollocksed. We'd have to start from scratch with all the spells. Reckon we'd be better off getting you a new one."