These things have been around for years. Drieaz do one you fill with either sand or lead balls. Used to squeeze water out on flood jobs.https://www.google.co.uk/search?q=drieaz+roller&rlz=1T4NDKB_enGB526GB526&source=lnms&tbm=isch&sa=X&ved=0CAgQ_AUoAmoVChMI2Ky3obOwxwIVy9caCh3l6g1a&biw=1366&bih=641#imgrc=_vIbS9qQwgD8KM%3A