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.
Making Video :
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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
In this video I am making a very useful tool for Spray Painting. A trigger handle that you can easily install and use of spray paints.