A drive roll carrier for supporting a drive roll in a wire feeder of a welder, the drive roll carrier comprising: a gear that can be driven to rotate; a hub defining an outer circumferential surface and supporting a drive roll to convey a welding wire, the hub arranged with respect to the gear so that rotation of the gear is translated into rotation of the hub and the drive roll, the hub including an inner end relatively closer to the gear and an outer end relatively farther from the gear and configured to receive the drive roll for mounting the drive roll on the drive roll carrier; a lug that extends longitudinally with respect to the hub and radially outward of the hub outer circumferential surface, the lug engaging the drive roll for transferring rotation of the hub to the drive roll and having an outer end that is arranged closer to the hub outer end than the retainer so that the drive roll engages the outer end of the lug to align the drive roll with the lug while mounting the drive roll on the drive roll carrier, wherein the lug includes an alignment segment that has a different profile shape than the rest of the lug, and characterised in that the drive roll carrier further comprises a retainer that extends from the outer circumferential surface of the hub and being movable in a generally radial direction with respect to the hub for accommodating mounting of and selectively holding the drive roll on the drive roll carrier; and, wherein the retainer is fixed in a longitudinal direction with respect to the hub, and wherein the retainers acts as detents that hold, in use, the drive roll by engaging an outwardly facing surface of the drive roll while allowing the drive roll to push in and pass over the top of the retainer when a user pushes or pulls the drive roll to mount or dismount the drive roll from the drive roll carrier. a gear that can be driven to rotate; a hub defining an outer circumferential surface and supporting a drive roll to convey a welding wire, the hub arranged with respect to the gear so that rotation of the gear is translated into rotation of the hub and the drive roll, the hub including an inner end relatively closer to the gear and an outer end relatively farther from the gear and configured to receive the drive roll for mounting the drive roll on the drive roll carrier; a lug that extends longitudinally with respect to the hub and radially outward of the hub outer circumferential surface, the lug engaging the drive roll for transferring rotation of the hub to the drive roll and having an outer end that is arranged closer to the hub outer end than the retainer so that the drive roll engages the outer end of the lug to align the drive roll with the lug while mounting the drive roll on the drive roll carrier, wherein the lug includes an alignment segment that has a different profile shape than the rest of the lug, and characterised in that the drive roll carrier further comprises a retainer that extends from the outer circumferential surface of the hub and being movable in a generally radial direction with respect to the hub for accommodating mounting of and selectively holding the drive roll on the drive roll carrier; and, wherein the retainer is fixed in a longitudinal direction with respect to the hub, and wherein the retainers acts as detents that hold, in use, the drive roll by engaging an outwardly facing surface of the drive roll while allowing the drive roll to push in and pass over the top of the retainer when a user pushes or pulls the drive roll to mount or dismount the drive roll from the drive roll carrier.