Oregon also make chains in the stay sharp range for petrol chainsaws, been using one on my Stihl saw for a few years now, so easy, attach stone to end of bar, start saw and push against a hard surface, 5 seconds all teeth sharpened, for a DIY'r its perfect: https://www.amazon.co.uk/OREGON-542...9D9RJY/ref=asc_df_B0049D9RJY/?tag=googshopuk-I have one of these and my neighbour does to great saw and you can sharpen on the saw as it has a stone built int to saw
https://www.screwfix.com/p/oregon-c...self-sharpening-chainsaw/6285k?ref=SFAppShare