Here is a picture of a HF tool I made using a long 7/32" allen wrench. It works great on Christmas ornaments and hickory nut HF's. It is only good around 1 1/2" of the rest and then it starts to flex, but for getting the ball of an ornament thin under the rim it is perfect. I heated it with a tourch to bend and then tempered it in oil. It holds an edge good and cost me next to nothing to make.
Jack
Jack