outer diameter of hub mount 13 furthermore as shown in fig8 inner core 29 is concentrically located within the hollow bore 35 of outer wall 27 but is offset axially with respect thereto so that one circular edge 37 of core 29 is radially aligned with circular edge 38 of outer wall 27 with the opposite circular edge 40 of inner core 29 being spaced axially inwardly from circular edge 41 of outer wall 27 thus as shown in fig4 circular edge 38 of hub member 22 is abutted against circular edge 41 of hub member 23 to provide for a continuous outer cylindrical surface on which tape roll 19 is wound outer circular edge 37 of hub member 23 extends over hub mount 11 and the outer extended edge 41 of outer cylindrical wall 27 of hub member 22 slides over the annular surface of hub mount 13 thus embodiment 1 includes two similar or identical hub members 22 and 23 that form hub 21 which members are placed in axial abutting relationship as shown in fig4 with one of the exposed ends having a diameter d provided by inner bore 29 which is slidably mounted over hub mount 11 with inner diameter d 1 of outer cylindrical wall 27 being complementary to the outer diameter of hub mount 13 and is slidably engageable therewith to rotatably mount tape roll 19 on frame 3 should a user attempt to place tape roll 19 and in particular hub 21 incorrectly on frame 3.