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Scilly.Suffolk
The op says he has 6 speed uni glide. Silly suffolk has assumed that the op has a 6 speed freewheel which maybe correct but maybe not. The op may have a 6 speed uni glide cassette in which case finding a 7 speed cassette is hard has they are almost extinct.
If the op use friction shifter and does fit a 7 speed cassette or freewheel then fiction shifters don't care what your sprocket spacing is. Down tube shifters should be friction