Leather key holder from レザークラフト塾.
2mm thick leather, spring hook, cowhide lace (3mm wide), keychain.
Before you express your indignation at me that I posted your pattern, file an industrial patent for your pattern. Almost all patterns have a commonly used solution or are shamelessly copied from normal manufacturers.
Leather key holder from レザークラフト塾.
2mm thick leather, spring hook, cowhide lace (3mm wide), keychain.