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I'm making a drill guide a bit of plywood. Extremely handy tool for opening 90 degree holes. Also the cost is very low. After watching the video you can do according to your own drill guide.
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18mm plywood
5cm marking - cutting
2cm marking
for my drill - 48mm hole saw - (Width to fit your drill)
2x - 11cm cutting (M8)
6X - 36mm cutting (Øin 8mm, Øout 10mm metal)
3x 34cm (Øout 8mm metal)
3X - 6cm hardwood Ø 25mm - Drilling 8,5mm
54mm hole saw