Drawing to scale

Oh I wish I’d done technical drawing at school. I’d know how to draw perfect circles and how to indicate cross sections. Yes I can draw around things, like this watch, but the line is very wobbly, then I wanted to draw an inner circle, but again its approximately a circle….. I’m a bit disappointed to be honest. I must find out if there is a particular template I can buy. If I’m going to learn, I need the right equipment. Another thing I need to invest in, and maybe an illustrated guide to technical drawing?

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