Product Description Specifications Used for replacing tailboom/fuselage former ring or tail boom attach fittings on the Bell 407 only.The top two holes are larger than the 206. This fixture comes with 2 drill bushings. One for the top holes and one for the bottom holes. A 3/16 drill bit used to drill the pilot hole as the TB specifies. ATA Chapter: 53-Fuselage Maintenance Type: Flightline Maintenance Type: Overhaul