When you change the size of object you’re printing on, or change pen brand, you usually need to re-adjust the proximal arm height. You do this in order to make the distal arm horizontal when the pen is resting on the egg.
After gluing a scale to the edge of the proximal arm, as show below, write down the setting for each object for future reference. A regular Avery adhesive label seems to have enough stickum to stay in place. Time will tell.
![](http://i.imgur.com/eWb2JJy.jpg)
And eyeball the setting using any straight object (pencil, ruler, etc.) resting on the two side frame tops.
![](http://i.imgur.com/RL662mz.jpg)