Come on Guys! You have to use a little more guile than that. Two suggestions: take on an ambitious project to make something very personal as a gift for her, and invite her input. Once the project is underway, talk about how much easier it would be to get the desired level of perfection if you only had the tool you need. Alternative, take her along to a woodworking show or at least a good tool store and just stare at the tool you want and say something to the effect of how useful that would be, and how much time and labor it would save, but you just hate to spend the money on something for yourself. Then if she goes for it, make her that personal item you know she would love as a way of expressing gratitude.