Glad to hear it works now. Have seen T/C Hawkens with same problem. My T/C Patriot also just stopped at half cock. I do lock work with the same skill as I have in brain surgery, so took it to Anson Morgan's Kenockee Trading Post here in Michigan. As I recall there is a short little rod between scear spring and scear. Whereever it is, Anson carefully took off .010 or .015", disremember exactly how much, and now it works.
This is too vague to be meant as a recipie for fixing a T/C lock, just to let you know there is another area to consider if your problem comes back.