Please choose the correct solution to the question: How to polish aluminum for a Back Pack Quick Release Pin

Solution1: You can polish the aluminum on your Quick Release Pin with sandpaper and grease. The smoother it is, the better it will slide.

Solution2: You can polish the aluminum on your Quick Release Pin with buffing wheel. The smoother it is, the better it will slide.

Answer format: solution1/solution2
Answer: solution2