problem is tried to drill it out in situ drill bit broke tried to pick it out no luck chanced a easy out in there that broke tried to break up the pieces stuck in the hole with a hilti nail(as that is harder than both the drill bit and easy out..)partial succes tried a bit of heat but as you know you have to be careful with head as it is aliminum if you heat it to much it just collapseon you so thought fuck it get another head....