Whenever I try close grips, occasionally, I grip them where the knurling on the bar begins as UA Iron suggested. I used to go very close in the past and I found that was even harder on the wrists. However, I dont do this movement much at all since it still irritates my wrists a good deal and has too much chest involvement. I train my chest twice a week, inclines and flats, and my chest is pretty sore for most of the days between. I like to let it recover fully. Sometimes after skull crushers Ill go right into 12-15 reps close grip press with the EZ curl bar to end the set.