Very different construction too, the Swissnor (sold by Schopper, not made by them) being very traditional in construction and virtually indistinguishable from a proper Thorens one, the Retrotone a heavier CNC machined from solid affair. I have the Swissonor one on mine which is certainly a lot flatter than my original, but if you have weapons-grade OCD still not 100%, and to be honest I’d expect it to be given it costs more than many turntables! Its good enough though, and as my aim was to restore rather than modify it is a decent substitute. I’d still love to find an absolutely flat original one though, but I suspect they all have just a little run-off due to the largely hand-made vintage construction techniques.