The water jet reaming tool can avoid the need to replace a toilet (17). The curved handle (19) allows the user to stay at arm's length away from the difficult removal of mineral deposits (13) which prevent sufficient clean water (14) to flush the toilet. A reamer element (12) stands ready at the other end of the handle (19) to enter a clean water jet (15) under the toilet inner rim (16). The user views (11) the water jet (15) and the point 26 via lines of sight (18) from the reflection in the metal mirror (30) attached to the reamer element (12). The user's wrist motions cause the handle (19) to rotate the reamer element (12) and grind the mineral deposits (13) to dust.

An apparatus for sharpening the head of a screwdriver is disclosed. The apparatus includes a grinder stone having a grinding surface for engaging the one or more front surfaces of the head of the screwdriver for grinding the one or more front surfaces, and a rotor coupling to the grinder. The rotor, in response to a press force applied from the head of the screwdriver to the grinder stone, rotates the grinder stone for grinding the one or more front surfaces of the head of the screwdriver.

The water jet reaming tool can avoid the need to replace a toilet (17). The curved handle (19) allows the user to stay at arm's length away from the difficult removal of mineral deposits (13) which prevent sufficient clean water (14) to flush the toilet. A reamer element (12) stands ready at the other end of the handle (19) to enter a clean water jet (15) under the toilet inner rim (16). The user views (11) the water jet (15) and the point 26 via lines of sight (18) from the reflection in the metal mirror (30) attached to the reamer element (12). The user's wrist motions cause the handle (19) to rotate the reamer element (12) and grind the mineral deposits (13) to dust.

A drive unit for imparting rotation to a drum assembly of a floor grinder. The drive unit includes a rotatable pulley positioned adjacent to and in contact with a rotatable drive surface of a driven pulley of the drum assembly and a drive surface of the drum assembly. The rotatable drive surface of the driven pulley is configured to impart rotation to the rotatable drive pulley during rotation of the rotatable drive surface, and the rotatable drive pulley is configured to impart rotation thereof to the drum assembly.