Wow, I tried to put mine on (gently) after lining it up just like I did with the backspace key, and the ESC key just snapped. This is my first massdrop keycap purchase and I am so disappointed. What a waste of time and money.
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edit: 1/26/18 update- So I contacted support and they refunded me the cost of the 1u key. Today, the middle stem of my backspace key broke as well. I am so incredibly disappointed. I liked the idea but I will NEVER buy from this "artist" ever again.