Hormann up and over garage door trouble

Joined
7 May 2011
Messages
251
Reaction score
8
Location
Durham
Country
United Kingdom
The door sags down on the left from outside.
the grub screws on the spindle needed tightening but i can't get enough tension in the cable by hand. Any advice on how to do tnat? I have taken enough slack out the cable so it doesn't jump but it still sags.
Thanks for any advice.
 
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