are both okay:
I tried but it won’t/wouldn’t go down.
Talking about getting a bike seat down.
it wouldn’t go down. Maybe I tried to put it down eg 30 minutes ago. Or maybe I tried 30 years ago.
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it wouldn’t go down. Maybe I tried to put it down eg 30 minutes ago. Or maybe I tried 30 years ago. It could mean either.
it won’t go down. Sounds like I tried eg 30 minutes ago.
Clive