I was about to continue building a simple cub. Plugged in the glue gun, but couldn't get it to feed glue. I noticed that the glue had oozed out of the top of the gun and gummed up the glue stick and feed mechanism. With a lot of effort and a very sharp knife, I was able to get the melted glue out of the gun. It is working fine again, but don't know if this is a common problem or not.