Yes!! I also have one and have used it on OBW blocks for the center and yes it does work and doesn't leave any marks on the fabric. It even helps with those annoying days when you just want to hit something!! A friend got one and when she uses it her dogs go crazy thinking someone is knocking on the door but my dog ignores it. I think I got it when I took a class from Susan Cleveland and she demonstrated it. I have a wooden meat tenderizer but it doesn't work as well -she said it's something to do with the material the hammer is made of. All I know is that it does work and it happy hanging on my pegboard with all those crazy notions I collect.