Solenoid Relative Force
The behavior you're describing (denting stuff) is a function of pressure not force. I could dent a bowling ball with a few grams of force if it was in a small enough area.

I'm not just being pedantic, it's a key to thinking of what you want to do. 24oz of force (yes, it is at a specified current) can be increased over small distances using levers, or you can get a smaller force over a longer distance, again using a lever. Force is just part of the equation; you need to consider the Work that Force will do.