My initial suggestion would be to get some thread adapters and try some different different styles of carts on your ego, maybe one will be just your fit, Thread Adaptors, they i are very cheap but I don't know what threading Ego uses, I'm guessing 510 since people say to get the Boge 510 cartos, I would try those first since that usually is the popular solution. I find that modifying or finding other products that work with your unit is better than running out and buying a new one, especially if you are like a friend of mine that had to wait like 2 months before his wife would let him spend more money to get his eGo lol.