each individual application as the blocks 110 are preferably fixed to the inner housing 104 it will be apparent that the position of the blocks 110 is dependent on the position of the inner housing relative to the outer housing 102 the outer housing 102 may also include an attachment mechanism 111 for attaching the display arm 100 to a fixed support such as a wall or ceiling typically the attachment mechanism 111 is mechanically attached to the outer housing 102 the mechanism may be a universal type mount or may be custom manufactured for the specific application in any event this attachment mechanism 111 is preferably designed to support the weight of the display arm 100 as well as the intended component 101 to be displayed with an appropriate safety factor built in it will be appreciated that the design criteria may incorporate live loads as well as dead loads due to the movement capabilities of the display arm 100 particularly with respect to the inner housing 104 relative to the outer housing 102 suitable attachment mechanisms 111 are well known in the industry attached to the second end 134 of the inner housing 104 may be a locking handle 114 this handle 114 may be utilized to selectively restrict or permit sliding of the inner housing 104 relative to the outer housing 102 by utilizing frictional forces generated between the.