Ok, i think i know why these don't work - i think they are for the MK3 not the MK2 - damn ebay seller
here is a pic of the one that look correct (off another ebay shop) -

See the difference to the pictures above!!! Help, help, help!!
Also, i have found the best way to keep these handles solid - is to use 3 washers on the large screw on the inside of the door, the handle does not spring back fully at first, but leave it a few days and it seems to work fine!