So just thought that i will share this DIY fix here hopefully somebody can benefit by this. after searching all over for a replacement impeller shaft which turned out fruitless i decided to come up with this fix. 1. good old fashioned welding rod. 2. remove all the flux and sandpaper nice and smooth with water sandpaper fine one. 3. cut to the correct size insert and reassemble and bobs your uncle works like a bomb. cheers Paul.