Grenade and  Mace interlocking puzzles

• These frightening lethal weapons are in fact very interesting and unusual descendants of The Gears puzzle.
• They are each  three-piece coordinate-motion puzzles. They use the same interlocking mechanism as The Gears, but differs by external shape.
• To assemble you have to put together three parts moving them simultaneously towards the center of the puzzle. As a matter of fact, their parts are interchangeable and can be mixed in any combination.
• It's a little more difficult to make them than The Gears because they have  beveled edges.

• The Grenade and the Mace have hollow cubical cavities inside, so to some extent they are Box Puzzles.

• The spaces contain little secrets which makes assembling more challenging.