To fully exhaust aerosol spray can, which is usually just thrown away, there are wonderful sites: valve and spray head. The latter, for example, can turn into a spray of ordinary rubber tubing. You only need to choose a tube head tightly into the hole of the proboscis pear.
Recommend to read
THE EDGE WILL BE SMOOTH
If you make the fixture shown in the picture, then cropped the Wallpaper strip will have the same dimensions and strict perpendicularity of the cutting line.
NEW PROSPECTS FOR SMALL GLIDERS
Judging by the pace, which is professional equipment in a recently available class gliders A1 soon and these "school" paritel can be divided into two distantly spaced from each other...