After one month of PE, can I use a cock ring?

Hey Guys,
From what i read on this board, a cock ring is used after a jelqing workout to sustain the blood to help with growth. Am i right?
If so, can I make one and use it after my workout? I do 600 2 second jelqs, and after 1 month have noticed a 0.1 inch growth. I do it with a 50% erect penis. Should I bother with grith workouts, or leave it to jelqing?

Thanks
Ash

Never underestimate a man. He may be slow, he may be weak and he may be an asshole but given the chance, he could put you to shame.

26/1/09 - BPEL - 5 inches, EG - Base 3.8 inches; mid shaft 4 inches