Step 1: What you need
- Duct tape, a colour of one of your Rubik's cube sides. You can get this from most department stores.
Step 2: Measuring and applying duct tape
Make sure it is not too big so that it goes over the cubie.
Cut this out and stick it on the matching coloured side on your Rubik's cube.
I would then recommend writing your initials or something on your Rubik's cube so that you know it is yours.
I wrote an 'L' on mine.