To connect a 510-threaded cartridge to the Dragon Egg by Lookah, which uses a 710 thread, you'll need an adapter. These adapters are available online or at specialty vape shops and will allow you to bridge the gap between the different threading sizes. Here’s a step-by-step guide on how to do it:

Purchase a 510 to 710 Thread Adapter: Look for a reputable vendor online or at a local vape shop. Make sure it’s specifically designed for converting 510-threaded cartridges to 710-threaded devices.

Attach the Adapter: Screw the 510 end of the adapter onto your oil cartridge. Ensure it is securely fastened but not overly tight to avoid damaging the threads.

Connect to the Dragon Egg: Once the adapter is attached to your 510 cartridge, screw the 710 end of the adapter into the Dragon Egg's threading.

Check for Compatibility: Ensure that the connection is snug and that there is no wobble. A secure connection will ensure optimal performance and prevent leaks.

Power On and Test: Turn on your Dragon Egg, following the manufacturer's instructions, and test the setup to ensure everything works correctly.

By using a 510 to 710 thread adapter, you can enjoy your 510 oil cartridges with the Dragon Egg without any issues.