I want to design twin screw of different pitch and different gap.

Please help me.

Example image

here is website link https://www.dhenryandsons.com/products/double-screws/

I tried it but i am only able to design like this

Dimensions are :
OD - 142.5 mm
ID - 38 mm
Pitch 1: 12mm

Pitch 2: 50 mm
Pitch 3: 30 mm

Edu SOLIDWORKS