This is a device for the smooth sticker of a protective paint tape along the inner corner. With this device, you can paste the paint tape exactly in t...he corner or with an even offset from the corner (0.5, 1, 1.5, 2 mm), the pusher is designed for a tape width of 20-30-40-50 mm. But if you have a Fusion360, you can adjust the pusher to any width of the tape. To do this, you only need to change the table variable in the source file (MODIFY→ Change Parameters). The same applies to the original cover file. I.e., the indent from the corner can be changed using a variable.