Ikeda 407 VTA adjustment

This looks like a great tonearm but I can't find much information on how VTA is adjusted. Ikeda users, how's it done? Grub screw on the base column? Do you find it to be a detraction from ease of use and quality of sound? Is something like the B-60 adjuster for the FR-66S available for the Ikeda 407?

I must admit, I'm pretty spoiled by the ease of Graham on-the-fly VTA. Still, I'm thinking about this tonearm for the 12-in. slot on my Lenco.

Thanks,
Bill