SURPRISED ME! Okay, here's the bottom of those buttons. YES, you can refill them. BUT you have to be very careful not to twist it when it reaches the end. If you accidentally do it, I understand, but then it's garbage. Unfortunately you can't see when the plunger arrives at the top to prevent this. But that's why you bought them right? Because they look pretty? Well you should just try to be careful. I screwed up the first pin trying to be careful. I was able to fill the second one thanks to the instructions of another seller here. So. If the pen is empty and you haven't rotated it, the easiest and quickest way to do this is to pull out the brush head. Comes out easily. Next take a metal straw, this will definitely work, insert it into the tube and squeeze firmly. Push until the plunger sinks to the bottom. Fill in liquid and replace brush tip. With a metal straw, everything is simple. If you plan on using these pens all the time, do yourself a favor and buy straws if you don't already have them. It is so easy. If you don't fill them up, just try whatever you can find around the house or garage that would be similar. Much luck!
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