You can also check some nearby garages or tire repair places. They change he balnce weights which are made of lead and just throw the old ones in a bucket. They come in different weights and I just cut off the longer pieces if I need less weight. I usually just put the plane so that it sits on the tail wheel on a table if it has one or the bottom of he fuse closest to the tail and then hold the plane by the spinner to see if it tilts to one side. I will also give the plane a slight push to the left and right if it doesn't tilt just to be sure that it self levels.