Go to Walmart dig deep in your pocket buy some Whamo steel shot steroids but there are 2 different sizes I for got is the smaller shot measure the bucking bar before you buy.
I had trouble with it before though I could trade it out from another motor that did not work because of a faint 2mm in length then I tried another dead exchange and it work so either the steel ball, length of bucking bar, or the next flower but adjustment or ...