a sport fishing outrigger assembly with a position adjustment positive locking mechanism capable of indexable adjustment and nonslip positive locking of a rotatably deployable outrigger boom assembly . the mechanism uses a fixably attached non - metal split collar with a plurality of castellated , vertically oriented indexing aperture slots . the slots receivable engage a metal locking bar as attached to a handle assembly , the assembly being mounted for pivotal , downward penetration of the bar with the aperture slots . the rotatable boom assembly is further isolated from an containing indexing pipe by a plastic bushing at the top and a plastic bearing at the bottom to prevent metal - on - metal rotation of the wearable parts .