On Feb 25, 10:12*am, "HeyBub" wrote:

The residual grout is easy to remove

Probably because whoever set them didn't wet the joints first.

How much success should I expect in resetting them on perhaps thicker
thinset, taking extra care to get them as level as possible?

I never tried it, but if the residual is 1/8" thick or less I suspect
it wouldn't be too difficult.

I would pull them from a bucket of water to set to encourage adhesion.
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- gpsman