на будующее - если все возможности выкрутить исчерпаны, то если есть мечек по резьбе то сверлите по центру дырочку диаметроммаксимальным который не повреджит резьбу и мечеком по старой резьбе выбираете то что там останется, ну или чемто острым выколупываете остатки в резьбе
вертолёт не авиамодель? а вопрос вполне общий - в самолётах тоже есть такие детальки с подобными проблемами
но не спорю, таки в вертолётном разделе эта тема бы смотрелась логичнее)))
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