Hi, I am looking for 10,000 Sofa Hinges to start and then several thousand a month thereafter.   ? Strength 200-300N·m ? 20,000  cycles ? 90-180 degrees ? 2° Pitch (45-50 steps) ? need either a black plastic or metal cover – the quieter, the better ? It cant be shaky ? need the tension set so it doesn't fall forward easily ? Can you customize the “L arm”? ? Need pricing on 10 thousand pairs (right and left hinges) ? Black unichrome Mike Snyder ergolign