Best way to open up a sub hole

[CheЯRyMan]

Heres the fastest way to open up a sub hole cutout you will need a router and .25 endmill. Use your router in a COUNTERCLOCKWISE motion. This allows the bit to run along inside the hole taking off fine amounts in a controlled way without digging into the cutout profile. Video Link

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[trumpet 5,000+ posts]

Have you seen this?

 

[DonH 5,000+ posts]

Measure twice cut once.