adjusted to fit a wide range of riser sizes in some embodiments the connection between first end 140 and second end 150 provided by adjustable ratchet mechanism 120 is releasable in some embodiments the connection between first end 140 and second end 150 provided by adjustable ratchet mechanism 120 prevents complete separation of the ends in other words the ratchet mechanism remains engaged in some embodiments the ratchet mechanism 120 is biased against contraction of the diameter of retainer ring 1 thus adjustable ratchet mechanism 120 prevents retainer ring 1 from contracting in response to radially applied forces and guard against deformation of retainer ring 1 which might lead to components of the universal secondary safety system falling through riser 3 towards the subterranean system at first end 1000 in some embodiments adjustable ratchet mechanism 120 allows the diameter of retainer ring 1 to increase by at least about 1 to about 10 referring again to fig2 2d in some embodiments side surface 110 of retainer ring 1 includes one or more pre drilled holes 130 sized to receive fasteners for fastening retainer ring 1 to interior walls 10 of riser 3 retainer ring 10 may be installed at any position along the length of interior wall 10 of riser 3 in some embodiments retainer ring 1 is installed near second end 2000 of riser 3 opposite the end which interfaces with the.