Cartridgedb has the FT-3 at 14g but no mass info on the MMT. I've read the MMT is also about that, so I guess between the MMT and FT-3 it's really the arm shape and the more expensive FT-4 providing on the fly VTA. I'd love the convenience of that but I might spend my listening time endlessly tweaking VTA.
Sumiko MMT vs FT-3 vs FT-4 opinions
I recently acquired a HW-19 MKII with a MMT mounted. I've found at cartridgedb that the FT-3 and FT-4 have the same mounting distance. I'm looking at them for a possibly easy, non destructive upgrade. I've read the FT-4 had an on the fly VTA adjustment, but other than arm type they all seem to have the same structure. Has anyone AB'd these arms anytime in the past? Should I just leave well enough alone for my $200-$300 cartridge budget?