there are a few training rackets in the market that are much more weighty than regular racket but retains the same badminton racket dimensions. they are usually between 120g to 150gram in weight. while they are not the most costly of racket, they still cost between US$50 onwards. i wonder if there is a way to convert an old regular racket to a training rackets, by someone adding weight to it. i couple of thoughts came to mind: - insert weight in the handle (ok to do balancing, but not end all solution) - lead tape on the outside of the frame - inject something into the middle of the racket. the racket frame is usually hollow. we can access to the cavity through removing the grommets. what can we inject? i don't know, glue? plaster? lead beads? any other thoughts or experience on this?