Hey Gio, why don't you buy the brass bleeder screw? My BMW's have all brass bleeder screws for quite some time, so they will not disintegrate every 5 years. Just change the O-ring and it's like new.
The brass bleeder screw is like this one in the linky.

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.