I repaired an old air grinder. The SI-2001 model from SINANO. did not work at all when I checked its operation. When disassembled the air motor and checked the inside, small dust was found.This caused scratches on the parts, which hindered rotation.

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【 Equipment used 】
camera　▶︎ iPhone 11
tripod　▶︎ Eienn SJ-002A
Edit　▶︎ Adobe Premiere Pro