Crop bars span across the width of your polytunnel on the intermediate hoops and they are used so that the structure is more robust (fig 7a).
NOTE: Crop bars are not installed on the two end hoops.
The crop bar is supplied in one piece. It is 1.17m long and is flattened on both ends (25/117FF) (fig 7b). Fit a Q clip (Q25) to one side of the hoop approximately head height. A Q clip can be pushed onto the hoop. If the Q clip is stiff use a hammer to tap onto the tube. Once the Q clip is on the hoop use a pair of pipe grips to closes the prongs together. Locate the flat end of the crop bar to the Q clip, push a bolt through the hole and loosely secure in place (fig 7c). Position another Q clip on the other side of the hoop and locate the other flat end to the Q clip and push a bolt through the hole and loosely secure in place. Move crop bar side to side until it is level. Check using a spirit level then securely tighten the nuts.
Repeat this process on the remaining intermediate hoops.
Click to enlarge
7a
7b
7c