I am looking for a new focus lens. for my laser box. Right now, I have to cut at 4x around. the center of the focus lens if scrapped. I can't get a pic of the scratchy lens.  the three mirrors do not scratch in any way.  Also, while trying to calibrate the laser. the piece of the machine I need to take off and adjust the front mirror.  I can't get it off. I am afraid to damage the laserbox if I try too hard. I cant not find a good schematic for the laser box to show you the right parts.it the piece that holds the mirror at a 45 deg.