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Unread 03-05-2016, 01:48 PM   #5
dhagin
builder, anti-builder, rebuilder -- Retired Moderator
 
Join Date: Mar 2009
Location: oahu
Posts: 13,164
I like Davy's idea of a dremel with diamond disc. I've used them for similar jobs and it will work, but you have to be careful not to ding up the stone or backer board too much. Just go slow and take your time.

Once you get the grout outa there, then take some photos of what you have and we'll see about getting backer rod in there. Backer rod is compressible, so you can squeeze larger diameter rod through a smaller opening.

Backer rod
https://www.google.com/search?q=foam...w=1280&bih=681
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dana

"the road to hell is paved with osb, mastic, pre-mixed latex 'grout' or 'thinset', "
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