• Ok, test results:

    First off, these are crazy strong: They actually stick to the walls in my flat, due (I think) to lead in the paint or a waterproof course or something). It is impossible to 'pour' the bearings onto a table, since they instantly attract each other and kind of flow together like mercury. COOL.

    Unfortunately, they are just a tiny bit too big :-( They go about 45% of the way into the allen key bolt head and stick there nice and snugly. BUT, since they stick out a touch, you can lever them out by hand.

    Oh well.

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