Somewhere there is a train that is going "thump-thump" as it passes over a gap in the rail ...
I make use of the weights that go with a second-hand weight machine that we bought several years ago -- they come in 2.5 lbs, 5 lbs., 10 lbs., and 25 lbs, which gives a lot of flexibility. I designed my press so that these weights can be secured directly on the lever.