I have an OC30 with the diamond missing. Unlike your 33 Hugo, all there is is the adhesive and a tiny crater where the diamond was. The OC30 sounded a tad beefier than the standard OC9 as I recall and one day I shall send it to EsCo to find out.
Can't wait to see what Johnnie can do for your KD750 tonearm. perhaps he can use yours as a guinea pig If the tonearm base can take a mini-din cardas plug then that would be great as I have a cable ready made..
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me