To be certain about the truss rod I would need to see it. But as a rule I would prefer to completely slacken a single action truss rod and remove the adjusting nut completely.
To unpick that a little, most truss rods are single acting. When you tighten them the truss rod does the work, when you loosen them, the string tension pulls back the other way. A double acting truss rod is one where the truss rod itself acts in both directions. Your Crafter is almost certainly equipped with a single action truss rod. I would take the opportunity to remove the truss rod nut completely as it will give you a chance to clean it and the threaded part of the truss rod and then lubricate it properly so that it works smoothly when you re-assemble.
What would REALLY help would be a couple of clear, large, pics of the break from a couple of angles. If I can see the nature of the break I might be able to work out some straightforward steps for you to follow to get the best repair possible.
How does that sound Dave?
When the going gets weird, the Weird turn Pro.