SME Headshell Standard Dimensions & AR XA/XB

[AvFan]

Does anyone know the SME standard dimension between the underside of the headshell where the cartridge attaches and the centerline of the connector barrel? The only reference I can find are two Jelco headshells that show the dimension as 4.5mm. I have a variety of headshells and they vary. Is 4.5mm the standard? Also, what is the dimension used on AR XAs and XBs? Thanks!

 

[AvFan]

Thanks! In the neighborhood but I'd ask you to turn the tape 90 degrees to measure what is in red below. (I just learned how to annotate a pdf on a Mac)