Now the tray is done. So we can make the pattern maker part.
Glue the two sides on the top plate (1). Make sure that the excellence of the side projections are on the side of the bore.
Glue is now the first plastic part at the front of the pattern maker part (with the contact adhesive) (2), and the 2nd plastic part at 35 mm of the first one. (3)
We use two plastic parts, so the pattern maker part moves rectilinearly over the tray.