How To Make Sinker Moulds What Is The Difference Between A Sinker And A Screwball?

What is the difference between a sinker and a screwball? - how to make sinker moulds

I think I know the difference. I tried to start a probe, and I'm pretty sure it was an oddball. My guess is to draw a downward and right (right turn) and a corkscrew is just harder. Someone knows how the release diffferntly? Please help:)