Lower driver loft 0.5 degrees when spin alone is high
Looking at the driver numbers, the speaker notes that if driver spin were slightly high while the other clubs were in a good spot, you could use the wrench to tick the loft half a degree lower. That takes about 300-400 RPM off the driver.
Channel: Club Champion
Watch official source at 14:03Why this context matters
Applies to an adjustable-hosel driver.