I would think a coil would longer than 4 uses.
Did you contact Dan? It's so new he should just replace it.
I am hoping it's was just a bad coil. Coils should last a long time. I thinking it was defective.
Hopefully this is a item that either fails right off the bat (defective) than one that wears out quickly.
This is a good reason why Dan should include an extra set of coils.
There inexpensive wouldn't add any real extra cost on Dan. Would save the customer some disappointment.
It also be crazy if he charges that much for shipping just the coils.
It shouldn't be more than a buck if only coils.
I can see that much if you wanted priority shipping.