Ender 3 Auto Rewind Spool Holder Mount revised

This is a simple addition for "Ender 3D Auto Rewind Spool Holder Mount only on one side". I had the same issue as Black_Mesa_Industries mentioned in his make [here](https://www.thingiverse.com/make:1050945). "*My filament roll was so heavy that i really had to screw the nut tight to hold the rod straight. This resulted in the spring being squished between the MAIN_PART.stl and the spring housing resulting in the spring not working properly. Fixed this by adding a second nut on the other side of the MAIN_PART.stl with a little opening for the spring lip to rest in. The two nuts push on each other, holding the rod straight, and no pressure is forced on to the spring.*" Black_Mesa_Industries did not provide this file, so I made to post.

As listed in the [original remix](https://www.thingiverse.com/thing:5448891), You will need these parts from the [original spool holder](https://www.thingiverse.com/thing:3338467/files)
- Clutch
- Dial
- Hub
- One of the springs. I chose the soft o