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Mounting a Jelco Tonearm

This is from a good friend of mine who is having a dilemna mounting a Jelco Tonearm.  I hope someone is able to help:

" I've been trying to determine a foolproof method for accurately locating the hole for a tonearm in a plinth.   I think the pivot to spindle distance or the total effective length provided by Jelco is just wrong.    Everytime I mount this thing it seems like it's not quite in the position it should be so the cartridges sit 1) in the middle of the headshell and 2) line up nicely with the alignment grid.  I think one of the numbers is wrong. But which one, and by how much?


I actually have one of those Dennesen Soundtracktors.   Do you remember those?  They are basically an older, plastic version of the expensive, but very nice aluminum Dr. Feikert one.


There's got to be a simple, logical way to work this out.  


It's amazing I can't seem to find information on the Internet about this.  I wonder what audio shops do?"

Thanks in advance for your comments,

Louis


128x128lou_setriodes
schubert
4,867 posts
 
Yes, he led me towards classical music which has done more for me than anything else of human origin   in my life .
I'm a bit  ashamed I was so bold . when I  joined A'gon I thought there was nothing but R&R fans on here so I acted out .
lou_setriodes's avatar
lou_setriodes OP
414 posts
 
Thanks for all of your responses everyone, my friend has figured it all out, happy and a healthy New Year to all you A'goners.  May we all have a great year.  Happy Listening!!!

vegasears
922 posts
 
Lou,  So are you going to tell us Jelco owner what the conclusion was, or are we gonna wonder if our arms are installed correctly?
lou_setriodes's avatar
lou_setriodes OP
414 posts
 
I wouldn't be able to tell you if your arms are installed correctly, I'm certainly no authority on the subject, that is why I was asking the question for a friend.  If it sounds good, I'm sure you have it set up correctly.

My friend replied to me that he got his turntable geometry worked out and that it's amazing when it's right because everything just snaps into place.  He then sent me a few pics of his TT which is a Technics SP25 in a custom plinth.
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