shell substantially prevents inversion or puckering of the rubber and thus substantially reduces incidents of undesirable results from rubber deformation particular embodiments of the present invention provide finger inserts 600 that extend substantially the entire longitudinal length of the stripper other embodiments provide inserts 600 that are some selected length shorter than the stripper rubber so that a desired length of rubber extends beyond the bottom of the shell a specific embodiment may be selected depending on the nature of the performance that is desired by the well operator a longer insert provides greater structural support to reduce rubber deformation whereas a shorter insert may provide a better fluid tight seal the finger insert embodiment depicted in fig6 is formed to provide a finger shoulder 680 proximate to and to either side of hinge portion 640 alternative embodiments substantially eliminate finger shoulders 680 so that hinge sides 690 are substantially contiguous with insert sides 620 further advantages of the present invention include a stripper rubber that maintains its profile that is resists longitudinal elastic deformation from bore pressures acting on the resilient substrate another advantage of the present invention is a stripper rubber that withstands the high sometimes explosive bore hole pressures encountered in certain wells by providing a stripper rubber that withstands high pressure the present invention enables effective pressure control.