Hello Reoville! I have never had a short (been rebuilding for a couple years) and now pretty much stick to the same single coil set up in all my grands. I use the RM2 on the grand in question.
The other day at work i was vaping on my everyday beater grand that has been in use for about 14 months. I had a .6 ohm single coil i had replaced that morning or the morning before. It was the middle of the day so i had at least been vaping on it for 5 hours. I handed it to a friend so he could have a couple vapes. He pushes the fire button and gets weak vapor. Pushes again and asks me whats wrong with it.
I get it back and the battery is rattling inside. Sure enough the spring was fried. I have no idea why the spring dropped. The batter was warm to the touch, but not hot. I get home and swap in a different spring (one of the old ones...not sub ohm) and rebuilt my coil. I'm not sure if using the old spring on a .6 ohm build was a bad idea, but i thought the spring would drop if something went wrong. I make sure my coil is right and not touching anything its not supposed to. Fired it a couple times and the old non SO spring dropped.
Ok, I thought i could have been the old spring this time. So I took a new SO spring off another grand and put it in the grand in question. Rebuilt another coil to the same specs (.6 ohm, made sure the placement is good). Get my coil going and wicked. Fire it a couple times and the spring drops.
I peeked under the delrin insert and all seems well under there. What am i doing wrong? I do believe all 3 fried springs got fried with the same battery (MNKE IMR-18650). Could the battery be causing the issues? I have to order more springs now because I am afraid to try the springs in my last 2 grands cause i need those operational. So I wont be able to give it another shot till i get more springs. I might add the 510 insulator looks just fine too.
The other day at work i was vaping on my everyday beater grand that has been in use for about 14 months. I had a .6 ohm single coil i had replaced that morning or the morning before. It was the middle of the day so i had at least been vaping on it for 5 hours. I handed it to a friend so he could have a couple vapes. He pushes the fire button and gets weak vapor. Pushes again and asks me whats wrong with it.
I get it back and the battery is rattling inside. Sure enough the spring was fried. I have no idea why the spring dropped. The batter was warm to the touch, but not hot. I get home and swap in a different spring (one of the old ones...not sub ohm) and rebuilt my coil. I'm not sure if using the old spring on a .6 ohm build was a bad idea, but i thought the spring would drop if something went wrong. I make sure my coil is right and not touching anything its not supposed to. Fired it a couple times and the old non SO spring dropped.
Ok, I thought i could have been the old spring this time. So I took a new SO spring off another grand and put it in the grand in question. Rebuilt another coil to the same specs (.6 ohm, made sure the placement is good). Get my coil going and wicked. Fire it a couple times and the spring drops.
I peeked under the delrin insert and all seems well under there. What am i doing wrong? I do believe all 3 fried springs got fried with the same battery (MNKE IMR-18650). Could the battery be causing the issues? I have to order more springs now because I am afraid to try the springs in my last 2 grands cause i need those operational. So I wont be able to give it another shot till i get more springs. I might add the 510 insulator looks just fine too.
hope thats all it is for ya 
Thank you so much for helping get this figured out. Glad twas an easy fix....now just to wait till more springs come in the mail...
