ya i did cleand with sand paper. and it is now much smooth.. i have a couple of other spark plugs which acording to mistriz are kharab. ( and they threw it in their shop as if it is useless and i asked them to give it to me i will take it and after sanding it and giving it to my friend it was runngin excellent on his bike ... so these things made me very sceptical of the mechanics .. they jst say this is kharaba nd replace it ... rather then verifing and then asking for rplacement of faulty.. they just predict and bangs the pocket.
i will also try to post the pics of other spark plugs. that are declared faulty for further inspection..