A month ago I got "tennis elbow" from blacksmithing. Lucky me, tennis elbow takes one to two years to heal and is very painful. Well after a month of doing nothing in the shop, I couldn't stand it so today I made a simple treadle hammer to hammer on the anvil. I couldn't find a suitable spring so I used a counter-weight instead (that is what the rope is for). The giant tap welded on is just for added weight and the hammer head is 1-1/4" rod. The 1" square tubing has 1/2" iron pipe inside for added strength. The 2x4 on the right side of the anvil is the "treadle". I have to do a little fine tuning but it does seem to work pretty well already. Can't see in the pictures but I have a chain holder with a stirrup to hold work down on the anvil too. Yes the anvil is somewhat mobile so I can move it around. Now I can make stuff again. After Thanksgiving when we get home again I'll make something.