Re: i made a 25 dollar ball vice for any jewelers who might be interested.
hy manakawari i am not into jewelry, but i had some tangency with precision engraving things; however, i looked over what you did, and i think that the most break-thorugh is not the small price, because somehow each one solves this by buying or crafting
but by using magnets, you could have achieved a great amount of moving for your table, within a low profile vice, and within a low added mass - thus such a thing is solved in mechanical vices by bigger and heavier profiled parts
by reducing magnets mounting height, you could get an even more lower profile; top vice can be made smaller/ligther ... there is always room for more, but what you did solved for the high price of such vices / kindly
ps : the way you added mass : just throw something in there and cement it ... i believe this can be made easier
ps2 : you can drop the price even more, as some items can be found in the kitchen, or with a bit of luck, right on the table
Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg