If you've got an engineering workshop near you, they'd be able to run a tap down the bar ends. I had the same dilemma, as after market weights that are as heavy as the Fazers are really expensive. Maybe you could hire a tap and die set. You need a 16mm tap @ 16 TPI (threads per inch). Initially I was told that it was necessary to run a 15mm drill bit down the bars, which have a 14mm inside diameter, before tapping them, but this has since been proved unnecessary. Good luck.