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Replacement part 151 for a Porter Cable 557 type 1 biscuit joiner. This part is no longer available from part suppliers, but now you can print your own and fix that otherwise-unfixable tool. May work with type 2 as well, but this hasn't been tested. I should stress that this will probably NOT work with type 3 or type 4 (but then, the replacement part is still available for those types.)
Note: part 150 is also available: https://www.shapeways.com/product/3GGXA445K/porter-cable-557-type-1-biscuit-joiner-part-150