Lycoming SI 1047B as referenced by the Direct Drive Overhaul Manual recommends Snap-O Tool Co. part no. CF-60C with CF-60C-1 abrasive cloth, or CF-60CS hone fitted with No. CF-61-12S medium grit stones - or equivalent.
A hone is a hone, but the Harbor Freight version, readily accessible locally, is identical design to CF-60CS with CF-61-12S stones (220 grit), and inexpensive. So far the form and function is good, and stones seem quality (no chipping or breaking).
A hone is a hone, but the Harbor Freight version, readily accessible locally, is identical design to CF-60CS with CF-61-12S stones (220 grit), and inexpensive. So far the form and function is good, and stones seem quality (no chipping or breaking).