What arm are you using with the Denon DL103. If it is on the light side like the VPI JMW9, the plate will be helpful, for heavier arms it is not necessary. I have a Denon DL160 as well - incredible cartridge. I was amazed at its different but still great presentation DL103R. A little less midrange magic than the DL103 but very quick and lively.
Enjoy!
Rene
Enjoy!
Rene