the working chamber of the laser welder.  In the back we have the shutter open switch used to open and close the shutter.  These three toggle switches are used to change the parameters of the beam and the memory from the inside of the working chamber.  These are the halogen bulbs.  They are in tandem so if one goes out they will both go out.  This is the protection glass.  It protects the inner mirrors from any dust or splatter that may damage them.  This black nozzle in the middle is the main argon nozzle.  This is where the argon comes out and flows onto the weld area.  This can be removed by pushing up on the release with your thumb.  Removing the nozzle frees up the work area for larger pieces like glasses, but the argon will not be flowing.  To put it back simply push the nozzle back in at a slight angle.  It may be tough to put back in so you will need to push hard.  This is the hand sensor.  It senses if your hands are inside the machine.  The bottom plate can be removed so you can get to the parts easier f you remove these screws.  The working chamber of the performance welder has a few extra parts.  The blue nozzle on the left and right.  The nozzle on the right will blow air on the piece to cool it down if you have it hooked up to an air compressor.  The nozzle on the left with the orange valve is an extra argon nozzle.  This can be used when you take out the main argon nozzle.