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Thank you so much! So doing a bit more research, it looks I'm gonna need some new tools if I replace the barb and olive (https://epicbleedsolutions.com/collections/shimano/products/shimano-hose-shortening-kit).
Feel free to call me an idiot if this is a stupid idea, but do I really need to replace them if I'm re-using the same hose? I'd rather not cut the hose shorter if possible, as it's about the perfect length right now.
There are two types for Shimano hoses, one type for the older BH59 hose and a different set for the newer BH90 hose.