Over time, the cork in the thermos like shrinks, it decreases in diameter and tightly stops clogging his throat. To restore the dimensions of the tube is possible by drilling it from the top blind hole and entering the back benches of thorn — wood truncated cone.
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Most comfortable furniture, "serious" joinery collect connecting parts on the thorns. Technical requirements for the quality of such nodes is usually very high. Run them by milling or...