An epicyclic gearing for a gas turbine aviation engine, the epicyclic gearing comprising: a plurality of planet gears circumferentially disposed about a transmission axis and operably coupled to a plurality of planet pins; a planet-carrier, the planet-carrier comprising: a side plate comprising a coupling portion for connecting the side plate to a rotating member or to a static structure, and a central ring coaxial to the side plate along the transmission axis, each planet pin of the plurality of planet pins being coupled to the central ring via a press-fit collar; and the press-fit collar defining a collar axis and comprising an annular body having: a first radial contact face defining a collar outer diameter, the first radial contact face interfacing with a pin opening defined by the central ring, a second radial contact face disposed radially inward of the first radial contact face and defining a collar inner diameter centered about a collar axis, the second radial contact face accepting one of the plurality of planet pins, and an axial face extending between the first radial contact face and the second radial contact face, the axial face facing the plurality of planet gears, the axial face defining a channel having an asymmetrical cross-sectional profile, the channel circumscribing the collar axis, wherein the asymmetrical cross-sectional profile reduces an edge contact pressure. a plurality of planet gears circumferentially disposed about a transmission axis and operably coupled to a plurality of planet pins; a planet-carrier, the planet-carrier comprising: a side plate comprising a coupling portion for connecting the side plate to a rotating member or to a static structure, and a central ring coaxial to the side plate along the transmission axis, each planet pin of the plurality of planet pins being coupled to the central ring via a press-fit collar; and a side plate comprising a coupling portion for connecting the side plate to a rotating member or to a static structure, and a central ring coaxial to the side plate along the transmission axis, each planet pin of the plurality of planet pins being coupled to the central ring via a press-fit collar; and the press-fit collar defining a collar axis and comprising an annular body having: a first radial contact face defining a collar outer diameter, the first radial contact face interfacing with a pin opening defined by the central ring, a second radial contact face disposed radially inward of the first radial contact face and defining a collar inner diameter centered about a collar axis, the second radial contact face accepting one of the plurality of planet pins, and an axial face extending between the first radial contact face and the second radial contact face, the axial face facing the plurality of planet gears, the axial face defining a channel having an asymmetrical cross-sectional profile, the channel circumscribing the collar axis, wherein the asymmetrical cross-sectional profile reduces an edge contact pressure. a first radial contact face defining a collar outer diameter, the first radial contact face interfacing with a pin opening defined by the central ring, a second radial contact face disposed radially inward of the first radial contact face and defining a collar inner diameter centered about a collar axis, the second radial contact face accepting one of the plurality of planet pins, and an axial face extending between the first radial contact face and the second radial contact face, the axial face facing the plurality of planet gears, the axial face defining a channel having an asymmetrical cross-sectional profile, the channel circumscribing the collar axis, wherein the asymmetrical cross-sectional profile reduces an edge contact pressure.