adjacent groove 122 is groove 124 which is useful in subsequent fishing operations after a disconnect the outer sleeve 106 has a recessed surface 126 adjacent surface 104 when surface 126 is juxtaposed next to the collet heads 102 they can move radially outwardly to clear shoulder 108 for a disengagement as shown in the bottom half of fig3 c there the collet heads 102 are no longer supported against the shoulder 108 by surface 104 instead surface 126 has moved into juxtaposition at the collet heads 102 as a result of an upward pull applied through the tubing string to the top sub 82 through thread 84 such an upward pull from the surface compresses the stack of bellville washers 92 when a predetermined force is reached thus shortening their overall length as ring 86 moves upwardly with top sub 82 the apparatus features additional rotational locks involving a series of lugs 128 which extend from top sub 82 into an elongated slot 130 thus apart from the thread connection 132 between the top sub 82 and outer sleeve 106 torque is transmitted through lugs 128 in slots 130 as shown in fig6 the bottom sub 110 can also extend sufficiently upwardly to engage extending segments 134 of ring 86 to facilitate torque transmission by locking the top sub 82 to the bottom sub 110 in operation.