Webra engines rock. They are great runners. I have been using them for almost 25 years.

To get them unstuck, fill them with glow fuel or marvel mystery oil and slowly work them out. Don't force them. I soak them in marvel myself and it takes a very short time to get them unstuck. Then after it is turning totally free, start them and run them and they will be fine. Don't use any harsh chemicals in them. Just fuel or marvel will do the trick.