adapted to hold a guide block 34 36 so that one is generally tangentially aligned with each of two sides of the sheave 22 as shown in fig1 each guide block 34 36 comprises back wall 38 and two sidewalls 40 42 a plurality of channel walls 44 46 are provided in between the sidewalls and generally parallel therewith to form a plurality of guide slots 48 50 52 the back wall 38 sidewalls 40 42 and channel walls 44 46 provide engagement surfaces which provide alignment of an elevator flat rope i e belt best shown hereinafter in fig2 sized for operative engagement with the guide blocks 34 36 and sheave 22 ideally the rope is aligned with the guide block to make as little contact with the back wall 38 as possible and most of the forces exerted for alignment control come from the sidewalls 40 42 and channel walls 44 46 the intention in general is that the rope touches the side and channel walls only in order to reduce wear and tear on the rope each guide block 34 36 may also be provided with a removable front wall 54 the front wall 54 may be transparent to allow viewing of elevator ropes beneath the wall 54 to inspect for wear each guide block 34 36 is mounted to a respective cross bracket 26 28 using angle brackets 56 and set screws 58 to facilitate position adjustment relative to the cross bracket 26 28 in a direction generally parallel thereto adjustment in a direction generally perpendicular to the cross brackets.