One of my air hoses developed a split near one end. It’d be good as new with a replacement fitting and new ferrule. The parts are cheap as chips, but the crimper’s more than I can justify to fix a $25 hose. Don’t suppose we have one floating around the shop somewhere?
Most of the ones I’ve found (that aren’t huge and/or hydraulic) look something like this: https://www.homedepot.com/p/Milton-Industries-Inc-Hose-Ferrule-Crimping-Tool-1626/301836727