Seb wrote:The only critical assumption is the 9 mm (FE distance).
That diagram looks about right, I got something close to this but couldn't get the headshell to draw correctly.
I will measure the distance "FE" tonight on the arm.
Do you think a straight arm will be possible? It looks to me from my sketches that making the arm 300mm long, but retaining the 60 deg triangle increases the angle between 'AC' and 'DC'. However, we want to reduce this angle to something like 18 deg for angular offset.
To make this work the angle at the small dome would need to be much greater than 60 deg (approx 100 deg) or the 20mm between the two domes much longer something like 74mm.