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In order to fit these larger chain plates into the old deck penetration, I had to modify the hole slightly. I used a series of flat files, starting with one that would fit into the existing hole. As the hole got wider, I would use a larger file until I had a standard flat bastard file to finish it off. The new chain plates were tight and had to be driven in with a dead blow. Before driving them in, I put a chamfer around the top extending about 1/4 into the deck. I also sealed the inside of the chain plate penetration with thickend epoxy.
This picture shows the chain plate just above its final resting place with butyl tape wrapped liberally around it. Driving this in to its home position pushed the butyl tape into the recess I created with the chamfer.