The process is not that complicate, yet still a hard job for a beginner. We cut the Aluminium pipe into 2 parts and drilled a d 5mm hole into it. After that, we drilled another d 12mm hole. So you can see it's not that difficult, however, we did it for 3 hours. The reason is that we had to make sure how long and how deep we had cut all the time. (I think some professionals can do it in less than 1 hour, I THINK.) But after all, today is a good start.
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