How would you do this? fill the undersides with sand?
Alas, I don't think there is an easy fix, short of making it a path "for
looking at only". You could tackle it bit by bit, lifting each stone,
excavating, and putting in a base. There's a reason that even a 'natural'
flagstone path laid directly into grass (and mowable) needs to have base
under each stone.
-- Karen
The Garden Gate http://garden-gate.prairienet.org
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"If you have a garden and a library, you have everything you need."
^and cats -- Cicero
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