I have a Gomtaro and a Sugoi. I think the Zubat and Gomtaro are impulse-hardened and non-sharpenable.
Sherrill has this for $25. http://www.sherrilltree.com/Silky-File-for-Sharpenable-Saws?gclid=CO_Imp_Ctb0CFVKDfgodKh8Anw#.UzWRmfldVyM
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