Fidelity Research FR64s Headshell dilemma

Dear @ct0517 : "" based on the design of this tonearm, did not think that a couple of millimetres either way, was that important ? ""

your whole statement posted and coming from you has no real sense because the design of any pivoted tonearm just not takes in count a comment like that.

That designer statement only confirms his very low/poor knowledge levels of the implications of 1mm-2mm differences in the overhang set up.
Yes he said it that way ( it comes in the instruction manual. ) the question is: why did it? when any pivoted tonearm can’t be designed for that 1mm difference in overhang can't makes a difference at all even with his ST choosed alignment.
Always will be a real difference that maybe we can’t detect it the quality level of what we listen of what that difference makes in tracking error and tracking distortions but are there.

Do you know which is the only difference between Löfgren A/Baerwald and Löfgren B alignments? the only difference is: around 0.5mm on the calculated overhang ( obviously that because are two different kind of alignments the null points calculated are different but with no relationship with the overhang calculated. ).

The FR designer not break the rules on the alignment issue it’s only that he just can’t understand it. His overall tonearm design has a lot of faulty/mistakes in what cartridge needs and asks to the tonearm for that cartridge can shows it at its best.

Everything is important in the cartridge/tonearm geometry alignment and its implications in the quality level we will listen with but the more important and main subject about is that we pivoted tonearm owners can understand it the true behind and the reality behind the overall tonearm alignments. This is the reall issue.

Chris, for my part I don’t care per sé about those alignment measurements I’m trying only to explain those important an critical implications.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

Stylus shapes.  By way of introduction. Peter wanted to impress
his friend John with his new swimmming pool. After some time he
asked: ''and what do you think?'' John; ''well how should I put
it but is 3x3 m, not to small?'' Peter: ''you idiot the pool is 30 m.
deep!''
Now assume that you can hear , say, 14 Khz.  Assuming that
you are not from Mexico so not able to hear with you bones
what sense makes to you that your stylus can reach 40 Khz? 
Because of my age I can't hear anything above 11Khz.
I think that I can live with even conical kind which btw is in
my Magic Diamond. Reto Andreoli  the desigenr of Magic diamond
is in the busieness of cart making since his 15 year of age and 
learned the trade by Australian brothers. Nobody ever complained
about hight frequencies of this cart. To assume to know better one
should show his accomplishments not verbal capabilites. 

To cut through the other stuff, Lohanimal, the statement you quoted does not indicate that one MUST use an FR headshell with an FR tonearm.  Is that what you meant to say?  Your quote from the owners manual only would stipulate that IF one is using an FR headshell, THEN one should place the stylus tip 7mm behind the front edge of the headshell.  This helpful hint does not prohibit the use of other headshells, so long as they properly fit the bayonet mount.  If using some other brand, one would simply need an alignment gauge for setting overhang.  And anyway, it would be at least as much of a pain in the ass to measure that 7mm as to use a proper alignment gauge, maybe worse.
As to accuracy, I think the best most of us can do is within 1mm net error (or +/-0.5mm, in other words), between setting P2S and overhang.  If you get it that close, you've done well.  Then there's the longitudinal angle of the cantilever with respect to the particular algorithm.  That requires patience.

I use an plastic caliper to determine stylus distance in any
of my headshells. The measured distance can then be used
by each headshell. To check the result I use Mint tractors for
each of my 3 tonearms. No problem at all to get this within
1mm value.

I think I have the headshell that you're looking for. It's unused & still in the packaging. Not sure how to get this message to you other than to post here.