Description
While it’s not required on some aircraft, rib stitching is probably the most reliable and most commonly used mechanical fastener. No. 501 – Curved Rd. Point Needles – Heavy Osborne No. Size (in) Gauge 501 2 2 17 501 2-1/2 2-1/2 17 501 3 3 16 501 4 4 15 501 6 6 14 501 8 8 13

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