I use threaded inserts with baltic birch plywood just fine.
I build large rockets (20 feet tall and 12" diameter) and the launch
guides are attached via threaded inserts in BB plywood. The rocket weighs
130 lbs and last year the rocket was in a vertical postion for over an
hour while being buffetted by 20 MPH winds.
None of the threaded inserts pulled out. I would suspect that standard
plywood would fare much worse due to the thick veneer layers.
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