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stevo_com
absurdbird
An axe? 🤪
Personally I would start knocking the wood off with a wide chisel watching carefully which way the grain wants to break off, making cross chop cuts (like cutting a hinge mortise or whatever) but this does require a 50mm v sharp chisel.
Definitely an option - a solution from the pre multi tool days
The mortar under the wooden cill can probably be raked out and replaced to get a good weather seal.