Rubber sledge hammer, you can hit it harderHave you tried hitting the outside of the bin with a wooden post ?
Jack hammer on leg will do the same, and stronger than the tin binJack hammer on sides with rubber on the end to stop it piercing bin.
So that's how liquid fertiliser was started, you been at the cutting edge of technology and set a trend back thenYears ago we had fertiliser in bulk and stored in a fiberglass hopper. We didn't notice the top was cracked and left rainwater in. That was fun!!!