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@adroit
I would take it all apart and have a look, I would be very surprised if you need a new throttle assembly, reinstalling it will probably sort it out. It has had a knock and has probably moved and the grip is tight against it, or something silly.
The lever blade should be available from any shop and it would be a case of removing the one pivot bolt and the adjuster. As the bars are steel, if not excessively bent I would leave or maybe try and bend them back.