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2.  Attach the wooden “yoke” to the back of the chair.  

This can be placed on the “inside” or the “outside” of 
the chair back depending on the depth of the seat 
needed.  Place the 

(2

) hex bolts

 

through the pre-drilled 

holes.  Place a nylon washer between the wood and the 
knob.  Secure with small knobs.  

Tighten securely

.

 

 

 

3.  Attach the Insert to the chair. 

A. 

 Place the lower carriage bolts through the slots in 

the back of the chair.  Place the upper carriage bolt 
through the hole in the top of the yoke. 

Note:  

The 

washer-nut / nut-washer combination should be on 
the “inside” of the chair.  Secure by placing the 
“flower” knobs (see illustration) on the ends of the 
carriage bolts.  

Tighten all knobs securely. 

 

B. 

 The Insert is adjusted vertically by loosening the 1

st

 

nut on the top bolt to allow the bolt to slide in the 
insert slot.  Loosening the lower pair of “flower” 
knobs allows the bolts to slide in the chair slots.  

Note:  The insert should be positioned so that 
the top of the “butterfly” straps are even with 
the shoulders.  

  

Re-tighten the nut and knobs 

securely

 once the appropriate height is obtained. 

 

C. 

 The seat depth (of the Adjustable Positioning 

Chair) can be reduced by up to 3” (with the 4” 
bolts) or 5” (with the 6” bolts) by changing the 
position of the 2

nd

 nut in relation to the 1

st

 nut.  

Note:

 The greater the distance between the two 

(2)

 

nuts, the greater the seat depth reduction. 

 

D. 

 When attaching the Winged Back Insert to the 

Bolster chair use the 4” bolts and place the insert 
close to the back of the chair. 

 
 

4.  The Butterfly Kit 

comes attached but may need to be reconfigured for a custom fit.  Place the top 

strap through the one of the top two paired vertical slots, and the bottom strap through the bottom 
two vertical slots in the insert.  

Note:  The insert should be positioned on the chair so that the top 

of the butterfly straps are even with the shoulders and the buckle is below the collarbone.  

Adjust the length of the top straps to position the chest piece at the desired location on the chest (see 
below).  Provide a “snug” fit by pulling on the lower set of straps only. 

 

Care should be taken not to position the harness higher than the notch felt at the 
top of the sternum (breast bone) as strangulation could occur.   

 

 

TherAdapt

®

 Winged Back Insert (WBI-100/200/300) Instructions:  Page 2 of  3 

 

Shoulder height

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