Spring Assembly for a Siege Machine

This is my first crack at this so I hope this goes well, apologies if things are otherwise. So here's the deal:

My intro Solidworks class has been tasked with designing siege machines and my group chose to use springs to supply the force. I've managed to come up with a crude design for the frame but don't know how to attach the springs in the assembly.

So the arrows point to where I want to attach the spring. This isn't how they will be attached in the end, but I figure if I can make this happen I'll be well on my way to the final design. Any help would be much appreciated, again apologies for missing information, picture quality, general disorganization etc.

SolidworksAssemblies