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Rowena,
from your description I assume the centre of the crosshair is in focus, but not the edges of the crosshair? If so then we are stuck, as either the hair has buckled, or the eyepiece has changed markedly. Both I doubt though.
The finders "normally" have an adjustment on the eyepiece, this is to focus the eyepiece on the crosshair, and needs to be set for your eyes, or for whoever is using the finder. THEN.. adjust the overall view focus via the objective which should turn/screwing/unscrewing until the view is sharp. During this last adjustment, the crosshair focus should not change.
Make sense?
Gary
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