[ARSCLIST] Eccentricity of LP's / spindle hole or OD?

[Ken Fritz <kftooldesign@xxxxxxxxxxx>]

    Hi all,

   I'm one of those audiophiles, 67 years of age, that wonders about  
the effect of the accuracy of the center hole. Some of the LPs  I put  
on the TT have play  due to a center  hole that's punched out of  
round, too large or what ever.

  I'm playing a record on a Denon  308 direct drive table using a  
system devised by a LJT Mfg  in Canada to reduce eccentricity and  
help flatten  warped records using a peripheral ring clamp in  
conjunction with a 1420 gram spindle clamp. The trio comes along   
with a cnc machined  polycarbonate centering disc that straddles the  
record after the clamp ring is set registering on the outside  
diameter of the record. I can feel play regarding the center hole as  
I  implement the OD  centering device.  I'll measure it tomorrow,  
just a few thousandths. The music sounds fine to my ears but I wonder  
what the relationship is to the record grooves, the outside diameter,  
and the center hole.

  A while back  a TT was made that had an extra arm that MEASURED  
THE ECCENTRICITY  of the record and re centered the disc  for play,  
it sells for big bucks if you can find one.

    FINALLY,  Your thoughts on the question?

  regards, Ken Fritz