An adjustable telescopic support having an elongated base member and an elongated mounting member. Cooperating guide means on the base and mounting members slidably mount the mounting member on the base member for longitudinal movement relative to the base member. Mounting means are provided on the front of the mounting member for use in mounting a manually operated unit on the support. Cooperating locking means on the base and mounting members selectively lock the mounting member to the base member in one of a plurality of longitudinally spaced apart locking positions so as to be able to position the manually operated unit on the support in a desired working position. The locking means on the mounting member includes an operating handle at the front of the mounting member. The support can be mounted on a support post if desired.