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Message: <blockquote data-quote="ken12292703" data-source="post: 2699205" data-attributes="member: 32">PART 2 - SMALL HOLESI got my mug at the same place at the same price and same process again. This time, small holes will be driven instead of big ones.[ATTACH=full]637712[/ATTACH][ATTACH=full]637713[/ATTACH][ATTACH=full]637714[/ATTACH][ATTACH=full]637715[/ATTACH]After calculations, i have to drill 8 holes with 6mm drill bit. Which is the same area with a 2 inches hole.[ATTACH=full]637716[/ATTACH][ATTACH=full]637717[/ATTACH][ATTACH=full]637718[/ATTACH]Mark and drill~[ATTACH=full]637719[/ATTACH][ATTACH=full]637720[/ATTACH]I tried it out when it was 8 hole. I found out that the back pressure high. I can feel the exhaust gas pushing my mug out and of course it is quiet. So, i drill 5 more smaller holes hoping it would reduce the back pressure a little.[ATTACH=full]637721[/ATTACH]</blockquote>

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