Jack,
Like Rich said, floorplates aren't hard, except about .005-.010" on the surface. They will bend.
There should be a little "draft angle" on the flooplate, similar to the draft angle on the parts that fit into the stock inletting. That part where there was a burr, you can take a little diamond sharpening stick (if you don't have diamond Swiss style files) and reduce the contact there by putting more draft angle in that area.
When you assemble it, you can put the watertable and floorplate in a vise with hardwood jaws and clamp it to seat it.
Chuck
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