@phoenixengnr From the table on the turntablebasics website,for a 230 mm EL the optimum OH is 18.14, and the angle is 24.083 deg:for a 229 mm EL the optimum OH is 18,05 and the angle is 23.972 deg.This kind of difference is hard to measure, thus not a drama.
The 1 mm error in 230 mm is 0.4%. I can't name manufacturers, but I recall both Fremer and Dudley mentioning this kind of error more than once.
Please read the references.