Either glue accessory to the base or import a "clip" and build on it.
In this example I mounted an extra trimmer spool to the trimmer body. When line runs out I don't need to go back to shed or garage to get new trim line.
Change the length or width as needed.

This object was made in Tinkercad. Edit it online https://www.tinkercad.com/things/3tMhpgr3zC9

XYZ da Vinci 1.0

No

No

med

med