Abstract: Hydraulic systems for bicycles or other small land vehicles include a master or control cylinder actuated by the brake lever, and a slave cylinder connected to the master cylinder by a hydraulic fluid line. The slave cylinder carries a piston, and the slave cylinder or piston is connected to the callipers for applying the brakes. With repeated use, the lever becomes loose or develops play. A solution to the problem provided by this invention incudes an adjustment screw in the slave cylinder for quickly and easily adjusting the position of the piston in the slave cylinder, so that in the rest position, the fluid pressure on the lever maintains the latter in a fixed position. An eccentric cam can also be mounted on the lever for adjusting the rest position of the lever with respect to a piston in the master cylinder to achieve the same effect.

Abstract: The disclosure herein describes a needle assembly for use with a syringe which includes a needle device having a holder and a needle, and a needle guard which is defined by a hollow cylindrical sheath that partially surrounds the needle; the guard has a first end mounted to the needle holder and an opposite closed end in proximity to the needle pointed end. Elongated slots and pivot pins cooperate to anchor the needle guard to the holder. In one embodiment, the slots are provided on the needle guard and the pins on the holder while, in a second embodiment, the slots are provided on the holder and the pins on the guard. This cooperating arrangement of the slot and pins allows the sheath to be pivoted back at substantially 180.degree. relative to its needle surrounding initial position thus removing the presence of the sheath as much as possible from the needle puncturing operation.