How much difference if the tonearm is mounted 5mm

Good morning,
Thanks to all of you who have answered to give advises in this matter. Yesterday, I mounted the arm 5mm shorter than manufactor reccomedation. The result was terific. I will run it for a few days to breaking in and will report back. In the mean time, does anyone know is there exists any head shell which has the mounting distance further than normal? All I can find is the Ortofon LH 9000 and the zyx headshell. I an leaning to the zyx but it is too expensive (700 retailed). How effective of a good design headshell soundwise?
Thanks
Calvin

The ''Zupreme'' sold by LP/Gear has the slots quite a bit forward.  This head shell is Magnesium  with the screw for azimuth adjustment.  Litz leads and are the same head shell as the Sumiko's.  Their just not branded as such and sell for $50 instead of the $90 that Sumiko's get!
In my opinion, the best head shell available!
Regards,

I will order the ZuPreme,
Thanks to all of you.
Calvin

Dear Dang,
In some responses, it seems the responder is confusing pivot to stylus tip distance with spindle to pivot distance.  If the spec for your tonearm is 212mm, spindle to pivot (P2S or PTS), then it is folly to tolerate a 5mm error in that parameter, as CLeeds and maybe some others already said.  If you are using a Dr. Feickert protractor, and if you observed a big problem when you set P2S to 212mm, then in some way you may be using the protractor incorrectly.  I use one, and one of its best features is the capacity to set up P2S before alignment of the cartridge body, because the arm that extends from spindle to pivot point, on the Feickert, is calibrated in mm.  Once one has done that, then aligning the cartridge is the veritable piece of cake.  I'm not sure what your problem is, from this distance.  Perhaps you are mislocating the pivot point on your tonearm.  If the manufacturer specifies a 212mm P2S distance, then the headshell should not be 4mm out of whack.  Only other possibility I can think of is if the tonearm is set up for Stevenson alignment, not the standard for the Feickert.

Hi Lewn,
Your response totally makes sense to me. Here is what had happended.
when i mounted the tonearm 212mm S2P the cartridge could not reach the crossmark on the Dr. Feickert Protractor, it seams like the slots are too short. Two days ago, I mounted it at 207mm, the cartridge can touch the crossmark now, but the offset angle is off at about 20 degree to get allignment correctly. As of now, all i can think of is the arm problem since I have used the Protractor before with the Vpi jmw and the Triplanar vii u2 with no problem at all. Please give me your opinion.
Thanks, and I used Baerwald, i will try Stevenson to see if it is any better.
Calvin