Thanks Nik!
7 mm: effective length 228.15, Baerwald 209.94, Löfgren B 209.42
8.5mm: effective length 229.49, Baerwald 211.4, Löfgren B 210.9
10 mm: effective length 230.84, Baerwald 212.86, Löfgren B 212.35
Assuming all these measurements are correct, it looks like the Aro/Keel is more optimized for a 8.5mm cartridge like Teme suggested.
James, looks like the GS would suit the newer Lyra quite nicely.
Makes you wonder what the pivot to third bolt measurement on the Aro vs. Ekos is?
Please don't place too much faith in my figures. There seemed to be some doubt about what the Aro spec actually was and I thought the pivot-to-cartridge bolt distance would help. It's easy to measure on the real thing and some trig would do the rest. The geometry/trig turned out to be trickier than I thought but I
think it's right.
It would make sense that the Aro's geometry is the same as the Ekos's and I think it is, bearing in mind measurement tolerances and rounding:-
Ekos: offset 24°, effective length 229 mm, pivot-spindle 211.
The "other" Aro spec is
Aro: offset 24°, effective length 230.5, pivot-spindle 212.5.
Taking that effective length we get
effective length 230.5, Baerwald 212.49, Löfgren B 211.98
but the offset should be 23.9°. I think this requires a stylus-to-cartridge bolt distance of 9.6 mm.
Might as well put it all together:-
7 mm: effective length 228.15, Baerwald 209.94, Löfgren B 209.42, offset 24.2
8 mm: effective length 229.04, Baerwald 210.91, Löfgren B 210.39, offset 24.1
8.5mm: effective length 229.49, Baerwald 211.39, Löfgren B 210.88, offset 24.0
9.6 mm: effective length 230.5, Baerwald 212.49, Löfgren B 211.98, offset 23.9
10 mm: effective length 230.84, Baerwald 212.86, Löfgren B 212.35, offset 23.9