disengage from each other as depicted in fig3 a second notch 102 having equal dimensions to the first 34 12 o 39 clock 34 notch 84 is disposed upon the outer shell orifice rim at a 90 u00b0 angle thereto thus the key when turned 90 u00b0 may be removed through this notch 102 in this position each tumbler is biased forwardly freely forwardly by the spring 60 while each corresponding block 44 is retained longitudinally within the recess 62 note the shell has no slots relative the circumferential position of the indentations 100 so the blocks may not move forwardly at this rotational point each tumbler 42 also continues to prevent its block 44 from falling completely out of the recess 62 since each tumbler 39 s 42 rearward most end 104 is also disposed over the annular recess 62 and indentations 100 once the key shaft 70 is removed from the mechanism with each block 44 seated in an indentation 100 the rotational position of each sleeve lug 90 may be reset when the key shaft 70 is then reinserted into the lock through the 90 u00b0 offset notch 102 each tumbler 42 may move rearwardly to a different longitudinal position than previously the blocks 44 however remain stationary throughout the key insertion and as such each set.