Next time you goto Walmart checkout the hardware section. They have stick on furniture bumpers, the smallest ones are about 1/4" in diameter and 1/8" high. They are clear too. I use them on the remote for my predator call, stick them on the keys to make it easier to do by touch with gloves on. One stuck on the little arrow on the door would be perfect. Here is a pick to show similar ones, they don't show the exact ones online.
http://www.walmart.com/ip/Soft-Touch-Assorted-Bumper-Protection-Pack/16782127
Great tip, unloaded. Thx!