I posted this hint given to me by 11 Outback V.
Get a hole saw kit that has the spindle & interchangeable hole sizes. Stack the current hole size inside the desired hole size and the smaller bit will act as a guide/hold it in place.
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Thread: Make hole in hull bigger
08-03-2012, 11:12 AM #8Drew
New ride: 2012 Mojo
Old ride: 2008 OBV