How do you handle air-sensitive samples during routine characterization?

I work with air- and moisture-sensitive inorganic compounds, and I keep running into problems when samples degrade between synthesis and characterization.

Even with glovebox work and sealed capillaries, I suspect some of my results are affected by trace oxygen or water.

How do others in the field manage sample transfer and mounting for techniques like X-ray diffraction or NMR without compromising the material?