this is for the lee pro 1000 (pre 2023) model
i added the newer style primer system from the lee pro 6000 and 2023 lee pro 1000 to my pre 2023 press.
i have run 500 primers so far and have no major issues.
i did make the part a little tight but i sanded it with a file to get it to fit without falling out

Update: I added a 2nd spring catch that will put the spring closer to center
The spacer_4.stl was causing the primer to hang up. Use the
Spacer.stl that is the file I should have uploaded from the start