I agree with
edyle. I had a similar problem. Try backing off the tank a little. Instead of super tight try just snug the tank down.
I ended up having to use a:
Ismoka Eleaf 510 - Ego Adapter
re:
Eleaf 510 to eGo Thread Adapter (Connector) by iSmoka
My RDA has no 510 adjustment so I ended up filing the top of the 510 male thread on the Ismoka Eleaf 510 - Ego Adapter to where electrical contact could be made ( it is soft brass,so I took off about 1/32" off the top barrel).
If your tank 510 connection has a non adjustable pin the above fix should work.
Before you do the above, you would want to test the adapter without any filing. If you have another topper, try that also to verify contact before filing.
If you happen to consider this fix, mod, adapter and tank will be snug. All wear and tear will be between tank and Eleaf 510 - Ego Adapter. Saves the sigelei 30w threads.
If you have any additional questions, just hit "like" at bottom right hand corner and I will get back to this thread.