Threadwork — Belt Thread Tools

Click a belt and the whole connected line gets marked for upgrade, to targets you pick. A panel (Ctrl+Shift+T) sets your belt, underground, splitter, loader and inserter targets; the Thread Upgrader (Ctrl+Shift+U) walks the connected thread and your bots swap everything over, inserters included. No tier lists and no upgrade chains: tiers are detected from belt speed, so any belt mod works, and it can upgrade between families the vanilla upgrade planner refuses to pair. Underground pairs are skipped if the target can't span the gap. Right-click cancels. Also includes a Thread Remover. Inspired by Belt Line Upgrade (Strayer_J) and Spaghetti Belt Tools (PietersieliePC).