I just came by a stihl 210c it has the 3/8 picco chain on it i filed it with a 5/32 file and the file seemed just barely to small it goes under the top plate instead of filing it down makes it paper thin but 3/16 is to long. Why do they have the 3/8 mini anyway why dont they just use 3/8 or .325. Do all 3/8 mini chains use a 5/32 file. Thx