A loading device (1000) for inserting a bushing (301 ) into a through-aperture in a flexible wall or a cap, said bushing having flanges (303, 305) projecting transversely at each end thereof, said flanges (303, 305) being resiliently foldable towards the longitudinal axis of said bushing (301 ), said loading device comprising: an inserter rod (101 ), a pincher (1, 501 ) and a loading (201 ). When the inserter (101 ) is pushed distally in an insertion direction, the bushing (301 ) is forced towards the loading tube (201 ) which will receive the bushing (301 ) therein with said flanges (303, 305) folded and projecting substantially axially.
