After reading your post I checked your measurements on a few props laying around. Mejzlik 26-10" actually 25-3/4, Mejzlik 27-10" actually 26-7/8, 3W-32-10" actually 31-1/2. The only props measuring as marked are the Bollys- 26-10 & 28-10 and a couple of PK props 27-10 and a 30-10. All the MENZ props I checked are a full 1/2 inch under. My guess is the Germans goofed on the metric conversions. Maybe these props grow to specs when running?he he