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After masking with tape I used what is known as a Forstner bit. Makes a nice clean hole. I started it straight in and, once it bit in, I moved the bit so I could drill the oval. I finished it with a dremel. Make sure you use silicone when you put the rubber things in. Makes them go in real easy.
Roscoe
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Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
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