Please choose the correct solution to the question: How do I smooth the iron bar ?

Solution1: Put the iron bar on a lathe, spin the iron bar. Start by passing a iron file on the spinning iron to smooth the bar, then use coarse (100 grit) sand paper on the spinning bar and finish by repeating the later but with a fine (400 grit) sandpaper.

Solution2: Put the iron bar on a workbench, spin the iron bar. Start by passing a iron file on the spinning iron to smooth the bar, then use coarse (100 grit) sand paper on the spinning bar and finish by repeating the later but with a fine (400 grit) sandpaper.

Answer format: solution1/solution2