I have an older Spyder Java that I got as a kit a couple years ago. The issue I am having I believe is occuring in the trigger mechanism. My bolt will not stay cocked. If I were to manually pull the bolt back and turn the gun over, it will sometimes catch. When I took the trigger apart I noted that there was a "boat" shaped piece that appears would move up and hold the bolt back. there is a small hole that I would assume some sort of spring or something would attach, but I did not see one. could this have been lost? How exactly does that trigger mechanism work? Is it a simple fix? Any help would be appreciated.