I bought a 3oz sea fishing lead weight and beat it square and long enough to fit the spine on a flat plate with a hammer cost me £1.50 and 5 mins of time. Mark the holes on the lead through the 2 holes in the chassis and drill to 3mm then put 2 screws up through (long enough to clear the lead but not too long they rub the prop) put nuts on the screw ends and tighten them down into the lead.
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