Jakers
Owner - Arbor Jake's Tree Service, LLC
i personally use the "yellow" ro-lock (i think thats rite) disks in an angle die grinder. lotsa soft plastic fingers that slowly remove the gasket. use em on aluminum all the time. have to be kinda careful cuz if you really try they will remove metal but not easily if you keep them moving. another trick i use on totally flat surfaces is the flat file. just gently ever so lighly slide it over the surface to find high spots or gasket leftovers