I've taken the cylinder head cover off my 205 XS to check the valve clearances. I had a lot of difficulty doing this as theres corrosion around the cover and the studs. I had to revert to push a very thin scraper into the rubber seal where the cover mates with the head and then pull up which eventually helped to get the cover off. I have oil passing by the cylinder head and the rubber seal of the cover already so plan to replace this. I wiped down the head surface and looks like there's a lot of scratches and marks there. I don't think that I caused this when I pushed the scraper in as I took a lot of care. There are a few that are quite deep. See attached photos of the scratches. What do I need to do to deal with this? Do I need to get the head skimmed? Or as it's on the cover end I don't need to worry about it? Any advice or opinions would be appreciated. Thanks