Simple structure that help soldering SMD components.
The general idea taken from https://www.thingiverse.com/thing:2772207
The design has been simplified, enforced, and adapted for 8x20mm spring(typical spring used in extruders).
- Spring 8x20mm
- 15mm M3 or M4 screw/nut
- 20mm long metal rod (e.g. part of bike spoke or m2 screw without cap)
The simplest way to connect metal end is to heat it up with soldering iron and stick it into the plastic.
Use m3 screw for arm/base connection for lesser tension.