shim (n)

Spring-tempered shims are not recommended for making adjustments as they can break and damage the drive.

This principle has been taken from glazing, where shims are used to fill gaps between the frame and the glass panel.

If it is not, correct the position by placing a shim between the non-adjustable Bearing Unit and the casing fastening bracket. The shim must be removed once the appropriate adjustments have been made.