kvetcha
Chet Hanks' Filmography Buff
The GeoDisc has been great for me. I've double checked it a few times with a two-point protractor and it's always spot on.I use a Geodisc and have been happy with it. I can align a cartridge with a Geodisc in 15 - 20 minutes. I simply do not change cartridges enough to justify owning a Fieckert.
The one extra accessory I use with the Geodisc is a metal yardstick to align to the pivot point versus just a visual line of sight.