Chainsaw Repair

I am using a 5/32 file in a flat guide like this

http://www.mowersupermarket.co.uk/product/323-73/OregonChainsawSharpenerandGuide16265%20http://mowersupermarket.co.uk/oregon-chainsaw-sharpener-and-guide-16265

In this pic there seems to be a file shaped area below the top edge,  is this what you mean by leaving the cutting edge blunt ??



I will post a pic of the file position tomorrow as it's too late now.  I have noticed that I am cutting lob sided,  which fits with me maybe sharpening better one side than the other.  Will try to get a better pic of the sharpened edge too. 

Many thanks for the help,  will continue tomorrow lol

Graham