91.2.3. THE BACK RESTThe back rest is fitted with an adjustable “shoulder joint”. Byloosening the two thumb screws one has the option of angling theshoulder joint forwards or backwards. To rase the back rest, thetwo bolts in the telescopic tube are loosended which become visiblewhen the shoulder joint is tipped backwards. The height of the backrest can now be adjusted and increased by up to 10 cm. Dependingon the wheelchair’s equipment, the following are selected: Fixedback angle, manual back angle or electrical back angle.Fixed back angle can be adapted (by using tools) by adjusting theangle brace on the back of the back rest. The brace is removed fromthe circular fixture at the one end and is extended or shortened byturning the ends in the thread in the middle section.Manual back angle is adjusted by operating the handle of the gasspring (push downwards) whilst the back rest is pushed into thedesired position. Release the handle in order to lock the back restin place again.Electric back angle is operated from the switch (normally placedon the same side as the control box).1.2.4. NECK SUPPORTThe height and position of the neck support (optional) are adjust-able. By loosening both hand screws, the neck support can bepositioned as desired.