Pacific (Hornady) Case Trimmer Head Size

[wtfooptimax200]

I use a Pacific manual case trimmer for all of my trimming duties. I found that the cutter head is not large enough to trim 480 Ruger brass. Does anyone know of a way to replace the cutter assembly with a larger size head that would allow me to trim calibers such as 480 Ruger and 500 S&W? Or should I give up on the Pacific and buy a new trimmer?

Thanks for any help.

Branden