How much difference if the tonearm is mounted 5mm

Dear Dang, I have not mounted a cartridge in several months, but it seems to me that my Feickert protractor, which is one of the older versions (assuming there are newer versions, which does appear to be the case), is designed for only one geometry, which I think is Baerwald.  Perhaps yours is different.  If yours has a Stevenson option, you might try it if only to verify that your tonearm was designed with Stevenson in mind. In which case, the headshell and the cartridge body will align with each other only for the Stevenson option.  This does not mean that you must use Stevenson.  It only means that you will be twisting the cartridge body with respect to the long axis of the headshell in order to attain any other geometry, and probably also needing to move the cartridge screws to the ends of the slots in the headshell to get Lofgren or Baerwald.  If you care to do it, you could try the recommended 212mm with Stevenson parameters.  If that gives you an alignment where the cartridge lines up with the headshell and the screws mount comfortably, I think we've explained your findings.  If you set up a "Stevenson" tonearm according to Lofgren or Baerwald, the recommended P2S is going to seem too long and the screws will be out at the end of their allotted travel, or beyond, and the cartridge will be "twisted".

ds, I haven't the time right now to digest all of what you wrote, but it seems in the first instance that you are talking about not trusting the template supplied with and for the tonearm.  I fully agree that this can be problematic.  I've had bad experiences in that regard myself. 

Lwem,

  Who exactly are you to trust if you have bought a tone arm in regards to setting it up?  'dangcaoguyen', the gentleman who initiated this thread, provided the information given to him and and asked if he could move the mounting hole over 5 mm?  Then gave reasons why when mounted using the supplied set-up dimensions,  His Quote
"the cartridge could not reach the cross point on my Dr. Feickert NG Protractor (I extended the cartridge all the way out from the Pivot) it was 4mm short. Unless i have a longer head shell or i will have to mount the arm 4mm closer than spec. (5mm to be sure)".
  Sounds rather familiar to me!!!!  Once you digest my thread, it should also sound familiar to you.
  I addressed his question.  I didn't expect others to give a destitation of text book arm geometry!  He wasn't asking for a schooling in arm design theory but just a simple answer to what he discovered.  His suggestions and discoveries, mirror mine! 
Regards,

Dear Griffit: "  He wasn't asking for a schooling in arm design theory but just a simple answer to what he discovered "

I totally agree but thing's are that I always post trying that in any audio subject where I have experiences not only say: " yes or no " but trying to learn more on that subject and that other people can do it.

We all will improve our audio knowledge level if we all understand where everything comes down, where is " generated ".

I'm sure that some of the gentlemans here and viewers of the thread already learned " something " on each single post in the thread and this ( for me ) is the right target in any audio forum.

In my case your contributions here do not gave any new " light " but through this thread I learned that the Dangcao protractor is for at least 3 different geometry alignments where the Lewm one ( same manufacturer. ) is only for Baerwald.

With all respect my sugestion for you is that instead to " blame " my posts will be better if you ignore it. How about?, sounds good: right?

Regards and enjoy the music,
R.

Raul,

Quote:
Dear Dangcaonguyen:  """ I mounted the arm 5mm shorter than manufactor reccomedation. The result was terific.  """

IMHO what it's terrific down there are only " terrible " and high distortions not real music information. End Quote:

This is your idea of helpful?  To criticize by questioning his findings after his deviation from the printed hole location.  Did you actually hear what his system sounded like?  It his system.  If it sounds terrific to him, then I believe him.  But to tell him that that what he is really hearing is ''terrible'' and high distortions not real music information is plain B/S!  
Regards,

Gentlements, please.
I have learned a lot from all of you since the thread initiated. 
Thanks,
Calvin