I was using my 3 pound sledge to start & then choking my regular sledge short when I got wedges started I don't have a 4 lb maybe I will pick one up yes it kills your back working that low I'm 6.4 ft I propped them on a 4 by 4 helped some I will figure some thing to get them higher, necessity is the mother of invention ,Diesel wood probably work but wouldn't want to store them in the shop after.