Hi,
I use corner blocks from the hardware store screwed into the edge of the shelf.
This will stop the tubs sliding out - though they do need tightening every now and again and could probably be improved on.
But reading your last post I'm not sure we are discussing the same thing - if your tubs are different heights then that's a fairly major problem. To be blunt if the tubs are different heights then you cannot really say the rack can use either unless you are planning to use lids on the shorter ones - and that is a total pain.
How big a difference are we talking here?
I try and have the gap between my tubs and the shelf above at about 2-3mm.
You could maybe use a removeable sheet of something moisture resistant fixed to the underside of the shelf above to fit the shorter tubs - but you would need to build the runners and catches for that into the design on the first build rather than try and add them later.
You might find it's easier simply to either find alternative tubs the same height or make a decision on so many of each and spacing the shelves appropriately.
dr del
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