I have some 6mm Ally checker plate due which I need to make some plate inserts for a bullet proof vest for a comic convention

Don't ask
Will I be better using a flap wheel or file and wet and dry to smooth the corners off
http://i00.i.aliimg.com/photo/v0/382003958/Level_III_BulletProof_Plate_AK47_.jpg Something like that
Also how can I put a slight bow in it without cracking the plate without a wheel or leaving hammer marks




Will I be better using a flap wheel or file and wet and dry to smooth the corners off
http://i00.i.aliimg.com/photo/v0/382003958/Level_III_BulletProof_Plate_AK47_.jpg Something like that
Also how can I put a slight bow in it without cracking the plate without a wheel or leaving hammer marks