this idea i thought of to make my vice rotates as it would be costy for me to get one online and its not found in Egypt.
check photos and video.
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I made a hole in a coin and hammered a bolt in it and in a bearing got from car parts supplier ... then i welded the coin back to the bearing outer ring.
Then i replaced it between the vice head and body and fixed it with washer and nut.
It cost me total 15 dollar, vice + fixture.
hope this would be helpful