I've set up the ET2 on various Sofa turntables dozens of times when I was the importer here in New Zealand ( for both products ).
I've always been able to set up with the ET2 mounted directly on the Sota armboard without any spacer required other than the aluminium plate provided by ET.Sounds like you simply need to move the arc block up the post as per @ct0517 suggestion above. Have a look at the drawing he provided.
I've always been able to set up with the ET2 mounted directly on the Sota armboard without any spacer required other than the aluminium plate provided by ET.Sounds like you simply need to move the arc block up the post as per @ct0517 suggestion above. Have a look at the drawing he provided.
See the Bolt in the smaller Blue Circle.As he also stated the purpose of the 3 holes for mounting the armtube is to get the centre of the bearing ( bearing spindle ) in line with the surface of the record. Then you position the arc block on the post, ideally with the VTA adjuster in the middle if possible which then gives you maximum up and down adjustability.
https://photos.app.goo.gl/hGcy2jPkRL7BYD7z7
It is important to try to keep the air bearing midpoint (inscribed line on casing) level with the record.