Well I've got all the parts I need to build my mbc, except 3. I need a 90 degree elbow that has a flat top, 1/2", and female threads. I also need the 1/4" I.D. Compression spring and the ball bearing. Lowes and Home Depot don't have the stuff, so does anyone know where I can grab one. Or, does anyone just have a mbc for sale? Either way would be great.