I've found an amazing tool for removing caps. Revlon Blackhead Remover. You can buy them at Walmart or any drugstore or whatever. I bought it for it's intended purpose, but I've found it works much better in my ecig toolkit. 
Amazon.com: Revlon Stainless Steel Blackhead Remover: Beauty
Check this out. The small end flares out, so it is just -barely- wider than the hole. It's also slightly curved. It literally just pulls the cap right out.

Amazon.com: Revlon Stainless Steel Blackhead Remover: Beauty
Check this out. The small end flares out, so it is just -barely- wider than the hole. It's also slightly curved. It literally just pulls the cap right out.

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