For the Lee Precision Pro 1000, Pro 4000 and the Pro 6000.
This is a reimagining of a gate to use rubber bands in the place of hard to find springs.
Thingiverse 4905095 uses a spring, this uses rubber bands.
When installing on a Pro 4000 you will need to raise the gate with washers or an additional nut. See photo for this.
This was copied from Fabio Favaretto of Italy who had stated that he didn't do business outside of Europe. He has since changed his mind. He has some wonderful ideas and has executed them very nicely. Look up his YouTube video channel.