Well I've done 3 months twice a week pins in each delt. .they get so sore now it obviously needs a break. I am looking for a new pain free muscle. Now I know I will get some pain but I don't want a spot like when I read of ppl having their leg so swollen they can barely walk. I'm also looking for a spot with little veins or anything else in the way. I was considering pecs or triceps. ...another concern is needle length. Do I change from the 1.3/4 ?