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바퀴 안쪽이 볼록할 철 모양으로 솟아있어서 그걸 구녕에 꼽아놓는 방식임

얘네는 작업칠때 떼기 쉬움



정확히는 핀 안박는 대신에 원가절감한거




viewimage.php?id=39afd128f6d437b463bac4a6&no=24b0d769e1d32ca73cee84fa11d02831cd949b6924735c7cb75a680f5f920fd1f7ead260f94e7cb57eb151de8cdda72072ffad77c748125c3ed4bbfea770d0f10a61945b1aad83dba99890d9e590bdf8a5b2030731be7d




그래서인지 핀으로 꼽는 방식이랑 혼용되는 경우도 있음



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이건 요철방향이 반대로 된거....


어느쪽으로 됬든 외관상 별로 좋진 않음