How do I know which Henderson Spring Hook to use?Updated a month ago
There are four Henderson Ultra Spring Adjusters, designed for use with the four different Ultra garage door models.
The most obvious difference with the spring hooks is whether they are actually hooks, or if they end in a nut/bolt.
- If you have a hook, your door model is either an Ultra 150 MK2 (3/8" thread) or an Ultra 225 (1/2" thread).
- If you have a nut/bolt, your door model is either an Ultra MK1 (3/8" thread) or an Ultra 210 (3/8" thread).
By checking whether it is a hook or bolt, and measuring the diameter of the thread, you should be able to determine which version you require.
If unsure, please do contact our team who will be able to advise further.