E-flite Mini Edge 3D ARF - Manual (Page 21)

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 5. Use a sharp hobby knife to cut the covering slightly
inside the lines drawn. Be very careful not to cut into
the underlying wood, as this will weaken the stab and
cause it to fail in flight.
Note : You can use a soldering iron instead of
a knife. This will eliminate the chance of cutting
into the wood.
 6. Hinge the elevator and stabilizer, using the same
process as described in Aileron Hinging. Use 4
hinges for this process.