line + helix + connect curve(between helix and line) = join.1
rotate "join.1 180 degre" = join.2
connect curve (between join1 and join 2 on topside) + join.1 + join.2 = join.3
use sweep to give diameter thickness.
Also you will need points and axis to create helix and lines.
well this is what i got
thanks a lot !!!