Extender And Jelq Questions

Hi guys i noticed that i can only use my right hand for wet jelq, with left hand i dont feel my penis is working and it become flaccid… and i dont know if do jelqs with only one hand is good, for this reason i am trying to do dry jelqs and feel it was working but is just for width? Please give me some advice, dry jelq or is better wet with just one hand?

And another question for extender, i bought an ads, is useful like a normal extender?