I have begun construction of the keel plug using a very large piece of oak that was milled from a tree that got blown down a few hurricanes ago. I have yet to lower the keel when boat not on water, and have not examined closely the keel slot, except from the cockpit. Before I go much further in trimming the oak I need to understand how it sits in or at the slot. The drawing in Rod's earlier post(1 of 4) shows the plug mostly in the slot and the keel well with only the tip of the forward steel plate touching the keel. It also looks like the plug is tapered going forward as well as aft from the flat section. I am unable to picture what keeps the plug from riding up higher into the well or slot
. Relying on Rod for more edification on the famous, or infamous, Cal21 keel plug.