Hammers are easy peasy.

Go to the local Home Depot or other big box store and buy a length of gray PVC electrical conduit. Not the white sprinkler pipe! Schedule 40 will work but Schedule 80 is better. You want the 3/4" stuff that comes in 10' lengths.

Now you need some old barbell plates (three 5lb plates will work just fine) with the 1" diameter center hole. Slide them on to the electrical conduit all the way down to the flared end of the pipe. Measure 50" from the bottom of the lowest plate and cut off the excess. Now look at the flared end of the pipe and cut off enough of the flare so that you've got about 1/2" to 3/4" to keep the weights from flying off. Take that cutoff piece and slip it over the other end and slide it all the way down to the weight plates. Wrap some duct tape around the pipe just above the plates to keep them from moving around when you carry your new hammer over your shoulder.