Abstract: Process for molding from a cast which includes the steps of: a) providing an insert which includes at least one through-hole; b) positioning this insert in a mold which has at least one feed channel, which leads to the end of this hole, such as to create a closed space, except for this hole; c) introducing through this feed channel, a hardenable fluid mass to form an overflow in this feed channel; d) leaving this hardenable fluid mass to harden, with this overflow, to form a hardened mass, without handling this hardened overflow, such as to reduce its area to less than that of the area of this hole; and e) withdrawing from this mold the ensemble of the insert and hardened mass, without handling this hardened overflow, such as to reduce its area to less than that of the area of this hole.