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Looks like this when done. Flip over the deck. Set the 2nd deck next to it. Mark the spots on the underside of the
deck house that match the location of your three 2nd deck magnets and roughen the locations with sandpaper.
The arrow shows how the 2nd deck (deck roof) small overhang is centered on the deck house doorway. Then
visually center the front and rear. Once the underside magnet epoxy cures, you can add a little more to cover the
underside magnets to better secure them. Sand all around the edge of the underside of the deck next to the lip.
Trace the inside of the three deck house hatches with a pencil to mark the trim lines. Slowly drill the corners with
a 3/16 inch drill. Use a hobby knife or box cutter to score the lines until the hatches are open.
Turn over the deck and set the 2nd deck on top of it. Turn both over together and drop each of the three remaining
magnets onto each roughened area. They will stick to the 2nd deck magnets. One at a time, mark the magnet, remove
it and scuff the unmarked side to help it stick, add some filled epoxy onto the spot and return the magnet.
Repeat for the other two magnets. Before the epoxy sets, while these underside magnets will still slide around,
turn the deck over and align the 2nd deck to the deck house so it is centered all around. Let the epoxy cure.