I’ve learned everything by buyin all of them, the 71L has huge aluminum cantilever, the 31L has conventional aluminum cantilever, actually ALL Glanz and Astatic comes with aluminum cantileevers, except ONE model - the Glanz MFG-61 (extremely rare, went for 1500 pounds about 5 years ago). It is not modified, it’s the original top of the line Glanz cartridge that has no analog in Astatic line. That’s why it’s such a great cartridge.
The MFG-61 has Paroc stylus, it is also line contact type, but special.
The cantilever is Boron.
As i said earlier the 610LX is not exactly like the earlier 61 model which i’m talking about as the reference. But 610LX looks closer to 61 than any other Glanz. And you will not find the 61 in that chart (manual). What you can do is to look on ebay for 610LX pictures of the cantilever and then look at any other Glanz/Astatic cantilevers. All of them comes with conventional aluminum cantilever like this The only difference is the lower models are not nude (the diamonds).
If you think the 71L is better go and buy it, but 610LX has better cantilever (maybe Beryllium or Boron), i’ve bought my 71L NOS, it was shipped to Axel to change the damper only, the cantilever was intact. You will find Glanz thread on audiogon to find more information. 71L and 61 is day and night in terms of sound, materials and price!
To make the story short: the best Glanz ever made is MF-61 with Boron Cantilever and Paroc nude diamond.