Fitting parts together.....

The pump section now is done, using an old Micron 005 in a stippling fashion for the light side, and using the Staedtler 0.05 in a stroking fashion, going up/down in a continuous motion for the shade part...  in so doing this, there is little pressure of the pens onto the canvas, just letting the tip lay and the ink to flow, going over and over until the desired grading of shading is deemed satisfactory...  and, for the light  stippling, there the tip is just touching the canvas so as to leave as little of the ink as can...