Bob, No land line this week, So no reply untill now. I stole the idea from a Southerly 28 I once owned (full size). It is triangular and pivoted at the front, made of 3/16th mild steel with a piece of sheet lead 4″ square inlayed so not that heavy. Centre plate would be a better discription. On my schooner I do have a proper drop keel 2 lb, on the stand it is held up. Attached by rods in tubes to the carry handel it remains up untill I let go, at the launch. Geoff.