old ass thread but heres my .2 cents anyway...
if you dont feel hammer curls, either with DBs or ROPE, then check your form...
also, you shouldnt always leave them for last in your biceps workout...switch it up everytime
you should feel it a lot on your "forearm" which by the way is still your bicep (brachioradialis) and yes, if done correctly they will thicken your upper arms.
what works really well for me is using the rope attachment at a station, and i stand about 3 feet away from the stack... holding the rope, i fully extend my arms
(at this point theyre almost at a 45 degree angle) and keeping my elbows fixed, i curl bringing my wrists to my face...
again, this wont really increase the peak of your bis but will greatly affect their width or thickness
