Anyway,

i would point out that Gary is still patiently supporting me in a very
good way.

Today he contacted me several times, offering a prompt swap solution.

With this discussion i'm trying to understand if i could fix the problem by
myself, saving time, because i'm near to a time deadline.

I'm still wondering if there is a way to reduce 1/8" steel balls diameter
for 40-50 micron with a DIY method.

Any suggestion will be appreciated.

Marco.