I will look at that tomorrow.
Something else I just found out, my plotter pen was not drawing properly, the ink was dried up .
I pulled another regular pen apart to put in pen holder, but it is to big, also plotter pen has a flange two thirds of the way down for the spring to push against.
I will google to find where to get special pen.
Never stops, does it? It helps to have a good sense of humor.