Hi All, I'm looking for a contractor who can change all my HDB casement window rivets from Aluminium to Stainless Steel so that we comply with the HDB regulations. I have a total of 11 window panes (4+3+2+2). If anyone has done this, please let me know how much you paid and the contractor's contact. I tried checking with one and they are asking for $300!! which I think is a lot for just the change in rivets. Also, does anyone know where I can buy louvre window frames? Thanks in advance..