OTC Tools OTC 1746 R400 Center Bushing Adapter Set. Used with OTC1740 basic tooling set, these adapters let you remove and install the new style R400 center bushings on Hendrickson suspensions. Set includes one OTC310248 removing adapter and one OTC310249 installing adapter. For R400 series Hendrickson suspensions having center bushing No. 49400 or field service center bushing No. 49600.