I used a hole saw.
Trevor, I couldn't find one either and bought the proper size hole saw from the aviation department at Lowes. Boelubed it up, clamped a 2x8 in the inside and drilled/cut away. Not perfect, but there wasn't a whole lot of cleanup to the hole. YMMV
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RVRC
Robert Cutter
RC & Moonpie
RV7 slider - First flight 5/3/14
Over 500 hours on the Hobbs now
N516RC
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