The one terminal post that slackened the whole span
Greenwood sits on deep, shifting clay, and the post that usually moves first is the terminal or corner post — the one anchoring the end of a run. Over years it can slowly drift out of true, and because it's carrying the tension for the whole span, every picket or panel between it and the next post goes slack even though not one of them is actually damaged. Reset that single post correctly and the whole span pulls back to true.



