Great Planes Yak-54 3D Indoor EP ARF - GPMA1131 - Manual (Page 7)

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o 4. On a flat, level work surface, place the base sections
of alignment jig pieces number 1,3, and 4 underneath the
fuselage in the locations shown.
o 5. Test fit the top sections of the alignment jig pieces onto
their corresponding bases. Install the motor mount onto the
front of the firewall, but
DO NOT glue it in place at this time.
Connect the top portions of the jig pieces to their bases by
applying a small amount of foam safe CA glue to the tabs
that overlap.
Be very careful to not glue the jig pieces to
the fuselage.