Extension spring help

[zinthorne]

I am working on a project that has very tight space constraints. I am sorry but I am cannot show a picture but basically I need to move a linear ram ~1 inch with atleast 10 pounds of force. I have 2 zones .43 inches by .5 inch by 2.7 inches long on either side of the ram.

I did some research into extension springs and I was able to find extension springs that would give me ~5lb worth of force. I was wondering if you guys have any other suggestions as a power source that I could use. I cannot use CO2 or compressed air.

These are the springs I was looking at.
http://www.leespring.com/browse_cata...p?springType=E

Any help is greatly appreciated!