TIGHITCO's Overhaul Support Services (OSS) MRO FAA Part 145 Certified repair shop in East Granby, CT was founded in 1974. OSS specializes in rotorcraft, to include spindles, rotor hubs, gearboxes, and swashplate. We are here to be your MRO solution, with fast turn times and quality OEM-approved repairs/overhauls.