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.
Recommend to read
COMES TO THE AID OF “LETRAN”
A simple actuator that turns ordinary wheelchairs into self-propelled designed for small business "Electric" engineer A. COHOM. The device is simple enough; to make it even in the...
“HULK”-JEEP
The machine is designed for everyday use and the near and even distant tourist travel not only on asphalt, but off road. The basis, or rather the prototype was an old GAS (UAZ)-69. The...
