As the copy GP235 was stereo I rewired the Stella for a stereo output, the arm already had the necessary wiring. As has been said elsewhere the sound quality from the copy GP235 was not fantastic, although probably good enough for the radiogram. Fed through the Heathkit S-33H in my den it was a bit lacking.
Ebay is awash with Chinese ceramic cartidges and although these are mainly single stylus types there is also a flipover/turnunder variant. I obtained one of these and dismantled the Philips cartidge to try and fit the new unit inside. The photo below shows the idea.
The arrows show the points of interest: the top pair show where the existing mounting pillars were milled away to give enough depth for the new cartridge. The middle pair shows where the existing side lugs were filed away to be a snug fit around the new cartridge. The bottom pair show where the new cartridge rests nicely on the existing lugs.
To be continued