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Select your location USA and watch the movie

Thank you, Vadim.
The stuff is very good. But as always. I learned a lot of useful things for myself.

I apologize for the offtopic.
For lifehack you will need:
Laser modul:

https://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=High+Precision+635nm+5mW+Red+Line+Laser+Diode+Module+for+Marking+device&_sop=15

The transporter with his own hands:

http://www.luaz967.ru/compiz/transportir-svoimi-rukami/

https://yadi.sk/i/3HXvbXIP3UBxR2

We get

Is it a matter of holding a quiz? A question on wits?
If you need an exact answer, it's best to use:

http://ermak-laser.ru/services/lazernyj-uglomer-ermak-50/

http://www.catra.org/pages/products/kniveslevel1/lgpm.htm

http://www.catra.org/pages/products/kniveslevel1/lkep.htm

Or use the method as in this video:

https://youtu.be/3ICnxj6TDjs

Yours faithfully Fedor.

Great video. Brilliant work.
A small remark. Or rather, wish. Make in programs (Paper Wheel Angle Setter, Grinding Angle Setter) Larger font in the input values and result windows.
Small font. You have to strain your eyesight. Especially on a smartphone with a 4.5 "
Everything else is great.
With respect Fedor.