You can swap without cutting, unless it's internally routed. I'd normally dremel the olive out, or cut the whole thing if I have enough hose.
I found a nearly new shifter to replace the one that probably leaks so want to swap over. Sounds like if I can get the olive off I’m golden then?
The olive is generally crushed on, try replacing neither, then replace both if that doesn't work.
@atz started
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You can swap without cutting, unless it's internally routed. I'd normally dremel the olive out, or cut the whole thing if I have enough hose.