Both adhesives were defective. They broke when I tried to insert them into the pen. I've had them before and never had any problems. I don't know if it was just a bad batch or if the quality has gone down. It was very disappointing that both broke when I had the project ready to glue. If it was just one of them I could attribute it to user error, although I've used them before. But the fact that they broke wasn't user error.
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