need help making spring and showing movement thru mates!

i need to put a spring fron the thru hole in the locking latch down and to the rear hole in the welded frame assy backplate then add the correct mates from one stop plate in front and tilted back til handle hits back stop plate can anyone help with these issues and explain how to acheive these.

pack and go is attached

SolidworksAssemblies