I reset my flagstone walkway two years ago. The stones are set in a mortar bed on top of an existing concrete walkway. Everything has been fine but the stone on the edge came loose and lost the seal with the mortar bed.
How do I reset it when the adjacent stones are still in place, including the adjacent joints?
I have chipped away a great deal of the mortar bed under the stone that came loose but I am afraid to chip out the adjacent joints and knock the other stones out. Is there any way to set it back in place and have it bond to the existing joints? Or do I have to chip away the joints? (this seems dangerous as it could cause a chain reaction where I end up knocking more stones loose and having to chip out more joints...)
Please help. Thank you.