I have an old wooden bed which is not easy to move (fairly heavy), so I want to put castors on it. The feet of the two headboard legs are rectangular and measure 45mm x 33mm. The feet of the footboard legs are circular and are 45mm diameter. I was thinking of putting castors on which have a metal sleeve which goes into the wooden foot, and then the bolt of the castor screws into this. But with the headboard feet being only 33mm wide I don't think they would accommodate the metal sleeves. Can anyone advise on this please?