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A locking system for a stop button employed in a mortise lock having a spindle for operating a latch utilizing a first spindle base and a second spindle base which are nested relative to one another. Each base includes an opening for the mortise lock spindle such that the spindle may enter the combi

A locking system for a stop button employed in a mortise lock having a spindle for operating a latch utilizing a first spindle base and a second spindle base which are nested relative to one another. Each base includes an opening for the mortise lock spindle such that the spindle may enter the combined first and second bases from the left side or the right side. A locking hub overrides either the first or second base and is capable of selectively lying over either the first or second base. An abutment linked to the stop button interacts with the locking hub such that either the first or second base may not be turned by the spindle when this occurs. Locking hub selectively locks either the first or second base through its position relative to the same and allows the mortise lock to easily transform from a left-hand version to a right-hand version.

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1. A reversibly handed mortise lock comprising: a. a first spindle base journaled for rotation within a mortise housing and engaged for rotation with a mortise lock spindle;b. a second spindle base, coaxially aligned with the first spindle base, the second spindle base also being journaled for rotat

1. A reversibly handed mortise lock comprising: a. a first spindle base journaled for rotation within a mortise housing and engaged for rotation with a mortise lock spindle;b. a second spindle base, coaxially aligned with the first spindle base, the second spindle base also being journaled for rotation within the mortise housing;c. a locking collar adapted to slide laterally between first and second positions over the first and second spindle bases, in the first position the locking collar interlocking only the first spindle base, and in the second position interlocking only the second spindle base, andd. a stopworks operable to be actuated between locking and unlocking configurations, the stopworks mechanically interfering with and preventing rotation of the connection of the locking collar and the corresponding spindle base to which it is interlocked at that moment, when the stopworks is in a locking configuration for preventing rotation of the spindle. 2. The reversibly handled mortise lock of claim 1, wherein the stopworks comprises a user-accessible stop button coupled to a flange that, when the stopworks is actuated into a locking configuration, extends into a corresponding slot of the locking collar. 3. The reversibly handed mortise lock of claim 1, further comprising a guide for engaging said first and second spindle bases and maintaining a side by side position of said first and second spindle bases. 4. The reversibly handed mortise lock of claim 1 in which said locking collar is mounted, when the stopworks is in an unlocking configuration, for coaxial rotation with the spindle base to which the locking collar is interlocked. 5. The reversibly handed mortise lock of claim 1, wherein the first spindle base is, structurally, a mirror image of the second spindle base. 6. The reversibly handed mortise lock of claim 1, further comprising a removable member operable to be fastened to a selected one of two opposing walls of the mortise housing in order to secure the locking collar into a selected one of the first and second positions. 7. The reversibly handed mortise lock of claim 6, wherein the removable member comprises a fastener. 8. The reversibly handed mortise lock of claim 7, wherein the fastener comprises a threaded screw. 9. A reversibly handed mortise lock comprising: a mortise lock housing;a latch bolt;first and second spindle bases journaled in the mortise lock housing for rotation about a common axis, each of said first and second spindle bases being coupled to the latch bolt to retract the latch bolt when the spindle base is rotated, wherein the first and spindle bases are, structurally, mirror image opposites of one another;a locking collar operable to selectively engage with, rotate coaxially with, and selectively prevent rotation of, a selected one of the first and second spindle bases;a stopworks coupled to the locking collar and operable between locking and unlocking configurations, the locking configuration causing the locking collar to prevent rotation of the selectively engaged spindle base, without interfering with rotation of the opposite spindle base, and the unlocking configuration causing the locking collar to rotate coaxially with the selectively engaged spindle base, allowing both spindle bases to rotate. 10. The reversibly handed mortise lock of claim 9, wherein the locking collar is operable to slide in a lateral direction from a position engaging the first spindle base to a position engaging the second spindle base. 11. The reversibly handed mortise lock of claim 9, further comprising a removable member operable to be fastened to a selected one of two opposing walls of the mortise lock housing in order to secure the locking collar into interlocking engagement with a selected one of the first and second spindle bases without interfering with rotation of the opposite spindle base. 12. The reversibly handed mortise lock of claim 11, wherein the removable member is operable to be fastened to the selected wall of the mortise lock housing from outside the mortise lock housing. 13. The reversibly handed mortise lock of claim 12, wherein the removable member comprises a fastener. 14. The reversibly handed mortise lock of claim 13, wherein the fastener comprises a threaded screw.