Apparatus and procedures for delivering tampon sacks having withdrawal strings at one end and inserter parts to an assembly turret having a plurality of operating heads on which the tampon sacks are assembled in the inserters, the apparatus comprising rotary transfer mechanism for engaging the withdrawal strings of the sacks and sequentially delivering them to a rotary assembly turret having a multiplicity of assembling stations mounted around its periphery. Each inserter comprises inner and outer parts, and feeding means are provided to individually feed and position an inner inserter and an outer inserter in holders at each assembly station.