@jwallis1 , Yes, I still use the Feickert. Like you I have used the Geodisc. It’s great, IF you can get the pivot lined up. I used a piece of string taped to the ridge line and I’d pull it out to ensure I was in alignment. Not scientific but it got me closer. The Geodisc is hard to use.
PM me and we can meet up.
I made a great friend on here back in 2017 by lending out the protractor. Kind of cool.