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TherAdapt

® 

Winged Back Insert (WBI-100/200/300) Instructions 

 

 
Packing List:  

 

 

 

 

 

 

 

Tools Needed: 

(1) 

Insert with 

(1) 

Head pad, and 

(1) 

Lumbosacral pad 

 

 

(1)

 7/16” open end wrench 

(1) 

Butterfly chest harness with 

(4)

 side release buckles and 

(2) 

straps 

 
(1) 

Wooden “Yoke” * 

(3) 

6” ¼ -20 carriage bolts * 

(3)

 4” ¼ -20 carriage bolts * 

(2) 

1 ¾” ¼ -20 hex head bolts * 

 

 

* Included in Hardware Bag 

(6) 

7/16” ¼ -20 hex nuts * 

(6) 

Metal washers * 

(3) 

“Flower” knobs with ¼ -20 threaded inserts * 

(2) 

Thru-knobs with ¼ -20 threaded inserts * 

(2) 

Nylon washers * 

 

The Winged Back Insert is designed to interface with the 

TherAdapt

 Adjustable Positioning 

Chair and 

TherAdapt

 Bolster Chair only.  Assemble, attach and adjusts as follows: 

 

1.  Assemble the Winged Back Insert:  

A. 

  Select either the 4” (for up to 3” of seat depth 

reduction) or the 6” (for up to 5” of seat depth 
reduction) carriage bolts for use. (Keep the unused 
set on hand.)  Insert 

(2)

 of the bolts into the two 

holes at the bottom of the insert.  Place a metal 
washer, followed by a nut, on each bolt and secure 
it in place.  

Important:

  With a 7/16” wrench (not 

included) tighten the nuts securely to “pull” the 
square neck of the bolt into the wood on the front 
side of the insert. 

 

B. 

  Insert 

(1)

 bolt through the center slot.   Place a 

metal washer, followed by a nut, on the bolt and 
secure it in place loosely until final position is 
determined.  Tighten as above once height 
adjustment is finalized. 

 

C. 

  Place a 2

nd

 nut, followed by a metal washer, on the 

bolt.  

Note:

  The greater the distance between the 

nuts the shorter the seat depth on the Adjustable 
Positioning Chair. 

 
 

TherAdapt

®

 Winged Back Insert (WBI-100/200/300) Instructions:  Page 1 of  3

Tighten the nut 
securely, pulling the 
square “neck” of the 
bolt into the hole. 

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