I have a set of the prism type beam benders. I put new tape on every year and park in front of the shed with the lights on and use the SWAG method (Scientific Wild Assed Guess)to align them. Masking tape will craze many plastics if left on in sunlight for too long, not sure about double sided tape but I get it off as soon as I can. I have heard tales of foreign police lurking at ferry ports picking up Brit vehicles without adapted headlights, but have never experienced it...