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Yes, I do this all the time! Best way is with a micro syringe that is small enough to get into the cart. Heat the cart slightly either with a hairdryer or blowtorch (careful not to overheat) and turn it upside down so the oil starts running. The next step is simply trial and error, and takes a few goes to get right, but basically syringe up as much as you can from each cart whilst the oil is warm and runny, then as a last step I like to leave all the carts upside down in a jar and leave that on low heat somewhere, you should get the remaining bits slowly trickle into the jar, which you can then add terpenes/do whatever/syringe up again and into a fresh cart. Best of luck!
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