GrowSpan PB01670R4, Manual

18

GROWSPAN

™

 ROUND PREMIUM HIGH TUNNELS

Revision date: 10.25.21

TWIST-OF-THE-WRIST ASSEMBLY

Gather the parts:
•  Aluminum channel
•  Drive handle
•  Gearbox and gearbox drive
•  Mounting plate
•  Bearing and threaded rod
•  1/4" X 2" Carriage bolts and 1/4" nuts 
•  3/8" nuts and washers  

The Twist-of-the-Wrist Assembly is designed to roll up a 

portion of the sides of the structure. The following steps 

describe the assembly and its installation.
1.  Drill a 5/16" hole through the cover conduit 1/2" from 

the end of the conduit.

2.  Insert a tubing adapter into the conduit and align 

the holes of the adapter with the drilled holes in the 

conduit.

3.  Select the aluminum channel and drill a 3/8" hole 

through the channel approximately 2" from the end and 

attach a threaded rod using a 3/8" nut on each side of 

the channel.

5/16" Nut

5/16" Nut

Flat Washer

Nut

2" 

4.  Position the channel along the end rafter at the end of 

the building where the Twist-of-the-Wrist assembly will 

be located.  

NOTE: 

Verify that the lower end of the channel is 

slightly off the ground to allow it to move freely when 

the panel is rolled up and down.

5.  Secure the upper end of the channel by drilling a 3/8" 

hole through the end rafter and attach as shown. The 

lower end of the channel will "float" and is not attached. 

NOTE:

 Install a flat washer between the nut and the 

end panel. Panel is not shown in the insert.

6.  Select the bearing bracket and attach the bearings as 

needed. (In some instances, the bearings may come 

already attached.) Assemble as follows: 

Single bearings are attached to the sides of the bracket 

and double bearings to the middle portion of the 

bracket. Use 1/4" hex bolts and locknuts as needed. 

Install a flat washer on both sides of each bearing to 

insure proper operation of bearings and the assembly. 

Install the longer bolts with bearings on the side of the 

bracket that has the two holes. Install these 

before

installing the double bearing assembles. See the 

figures below.

7.  For the spacers on the long bolts, insert a 5/16" nut 

over each bolt. 

These nuts are used as spacers only.