Just remember to keep your hands, arms, feet, and any other body parts away from the machine until you know for sure that nothing is going to move when the chips are unloaded. I have seen where there is enough pressure to move a part quickly when a jam is released and a person could be badly injured. I would use something like a 1/2" steel pipe about 4 or 5 feet long to work the chips out and free the drum. Even with the springs off, it doesn't mean that the drum can't spin. I don't want your next post to be written with one arm in a sling and the other on the key board or worse. Just be cautious, because the life you save might be your own. Eye protection also required.