On Sun, 01 May 2016 10:17:42 -0500, dpb wrote:

On 05/01/2016 8:27 AM, wrote:
We are looking to replace single steel door with sectional door. The
side springs look different from all others I have seen with a long
bolt in the end of the spring. How are these removed? ...

Carefully, perhaps?

Prop up the door to remove w/o tension; unless you've got adequate help
use a mechanical aid such as a comealong or winch to then lower the door.

We don't know the OP's skills - yet.

He can look here for days. Read and study. Credits to my Huckleberry
friend, Danny D.

http://ddmgaragedoors.com/index.php