I use the coin thimble that I can get at JoAnn's. It is leather, w/ a metal dimple coin that covers the pad of my finger. That is what I use to push the needle thru the fabric. I also have tried many kinds of thimbles. I like the leather thimbles because I can feel the needle as i place it to rock it thru the quilt.
The other thimble that I like is The Comfort Thimble, I just haven't gotten around to ordering one. Hmmmm maybe over spring break....