My cart refill is very tough to put through my tube tank. Its a single coil, but the base seems almost impossible to completely fit. Am I doing something wrong, or should I add a bit of juice to the carts side before I put it through the tube tank? any advice would be great, I was so excited to get the cart refills but now Im at a loss on to why this is happening. yes they are the proper refills I bought them from volcano where it said cart refills for Lavatank

