kevlar midrange fixation nut factory setting torque???tension??? help!

[meccumi]

hello everyone
i am a newcomer of the b&w diamond series
and i found that at the back of the midrange there is an aluminium one slotted screw which fixes kevlar mid
the question is what is the exact tension should be applied to kevlar mid?
should i fasten tight with coin or should i fasten only a minor friction can be feeled with my fingers?
i think some one should have the same question as me
right now i have fastened with a little protrusion of the one slotted screw out of the aluminium ring which surrounds the nut
because when i fastened too tight the sound became too solid
does anyone has some know-how please share with me
thanx bye~

[JürgenW]

Just fasten it with your fingers.

It's been asked before (quite a lot of times). The real good answer is that it should be done with professional equipment (by a dealer).

If you search for 'torque' in this forum you will find e.g.:

http://www.htguide.com/forum/showthread.php?40000-B-amp-W-800-series-midrange-torque&highlight=torque