This is a very complex question that will not likely have a simple solution.
Two questions were asked recently that seem, on the surface, to have no relation to A&C. One has since been edited in a way that makes it (in my opinion) a good question for the site.
This one still doesn't seem like a good fit to me:
Can I patch up a straw hat?
This one, I think is good, but please note the original version of the question:
How to glue mug pieces
My concern is that allowing simple "repair" questions like this that have little to do with arts and crafts could be problematic.
Is "fixing" a random object in your home "on topic"?
If not, could we encourage users to think of an alternate question that would get the answer they need but be more related to A&C, the way the mug question did?
Another example I thought worth mentioning is Erica's question about mending her pants:
How can I hand-sew an "invisible" hem?
While fixing her pants might not be on-topic, finding the technique described in the question (which could be used for a wide variety of projects) makes the final use of the technique immaterial... this is a good example of how questions might be rephrased to fit the scope of our site.