Originally Posted by Webby 
Chisel was the word you were looking for
and the sand paper was probably wet and dry or emery paper.
or glass paper 
they are all basically the same, you can use sand paper to file down and smooth mild steel, but the resaults are a bit rough
Glad you got them sorted
We wait for pictures
Indeed and we must have pic's
I did mean the fan grill only on the rear fan as the front fans have a fliter and the case front in the way of fingures
Webby look back at my giant posts and you'll see my answer to thoes rubber plugs, which instead of costing £5 per fan, costs roughtly £3 (+£3 if you need to buy a cigarette lighter and some m6 silicon washer) for 9 fans