And then I managed to extrude only some faces of my sketch to add the notched part. My last issue is that I loose the arc edge when extruding these faces, I'm not sure why https://cdn.discordapp.com/attachments/796072568385568808/1473345674467741916/image.png?ex=6995df96&is=69948e16&hm=34bea717bfee7013b82cb97459025d85fcf89c1b6f08f8915ad73d9f95ffec4a&