I have been using the guides from Stihl I spoke of earlier, including the raker gauge. After filing as I did, 2 moderate strokes and 1 very light, I used the raker gauge. The rakers that I checked, probably 10-12, were all just below the surface of the gauge, I proceeded to give the rakers a single stroke with my flat file, hence the flattening at the top of the raker visible in the pic. I can see now that I need to blend that bit rather than have the hard transition. The hook however, I don't quite understand how I can increase that using the guide that I have. Would I adjust my in and out angle? Or the up and down angle? I may need to modify the Stihl guide to allow the file to ride a bit lower or just give up on the guide altogether, it really seems to block alot of the view of the tooth. I think I have a near shot loop of RMC3 that I will throw on tomorrow and give the file a try with no guide. Thanks again.