AmazingChina: Resistance Welding 

Check out the video of a master artisan creating a teapot from clay, one of my favorite videos: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-6rLgf_ys0vo.html

This is the spot welder we are producing.

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Holding it by hand could lead to a problem. If the holder tilts the plate too much one way or the other it could cause that bolt or another bolt to incorrectly line up with the weldnut throwing the entire product out of tolerance