Dear @dogberry : " try repairing some Decca cartridges! "
I don't own a Decca cartridge but you can ask to this retipper ( @needlestein that is the same gentleman I recomended to you for your beloved C. ) that is a very good alternative and in the next link you see his perfect " job with some of my cartridges ( I sended 10 cartridges. ) where I ask to change only the stylus and in the pictures you can see that both channels measured dbs are exactly the same and this is not easy to achieve when even today top cartridges ( some models ) comes with not centered stylus that's a must to have that way:
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.