Just in case anyone is still interested I thought I would conclude the saga
I received the mod back today. Rob said it was not my attomizer that caused the short. He said he was puzzled, but his guess was also a bur may have been left in the threads. Now here's the great part! He took care of it himself this time, replaced the 510, it's now butter smooth! Every atty works perfectly on it! What's more, he took it upon himself to refund me $20.00 to cover my extra shipping cost! This is the customer support you only get with Reo's mods! Just wanted to share the good news, and how awsome Rob handled it!