How to use:

1. Take your plotter pen adapter, and put it on your pen loosely. 

2. Push the tip of the pen into the jig. 

3. Once the tip hits the bottom, your pen is at the exact correct height for plotting

4. Plot! 

I have a lot of adapters for HP Plotter pens. Sometimes, the same adapter fits different pens. But getting the height exactly right can be a bore, and I made this jig to help with it.