Converting a tabletop grinder into a disc grinder～卓上グラインダーをディスクグラインダーに改造～

I tried converting the desktop grinder I repaired last time into a disc grinder.
Click here for the plan
https://jsk-koubou.stores.jp/

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How to make an Angle-jig that reuses a protractor
https://youtu.be K_Kmpjtk2E8