piece safety disc 13 positioned under the sectioned internal shoulder 7 and above the disc support 11 fig2 shows a portion of the bottle neck insert 3 with a weld coil 15 the projection tip 12 has been grasped and pulled outward showing the flexible support projection 10 in its open position fig3 shows a screw cap 16 screw threads 18 and cap projections 17 fig4 shows the bottle neck insert 3 with the safety disc 13 being held firmly in place by three of the disc supports 11 each break in the internal shoulder 7 is next to or above a flexible disc support projection 10 fig5 shows the bottle neck insert 3 minus the safety disc 13 this view shows the relationship of disc retainer 9 to the flexible disc support projection 10 disc retainer 9 is contiguous to flexible disc support projection 10 but does not touch it this allows flexible disc support projection 10 to move independently of disc retainer 9 which remains stationary fig6 shows another embodiment of the bottle neck insert 3 numeral 35 designates a tamper proof bottle neck insert comprising a rim projection 19 a rim stop 4 a weld coil 15 a flexible disc support projection 10 a disc support 11 a disc retainer 9 a sectioned.