Hi dreamer,
Thnx for suggestion on the 'buttons', as it happens, I had figured they go over the small holes at the bottom of the circular outer 'columns' on the baseplate but couldn't figure out why the tight fit, so was on the verge of inverting, filling with stand, then getting a mallet to hammer home!
Might help if the manufacturer supplied 1) instructions for use (for the thickos among us), and 2) plastic sausages for bagging the sand/shot.
Regds,
HT