Seeking anchor roller advice

I have the traditional anchor bow roller set up on my Nonsuch 30. Currently, there is a smallish Bruce anchor which fits nicely. I’d like to get a larger anchor such as a Rocna, Manson Supreme, or Mantus. However, I’ve tried both a Rocna and a Mantus and neither fits particularly well on the anchor roller. I’m assuming the Manson would be the same.

Has anyone modified their anchor roller to fit one of these anchors? I’d be very interested in hearing/seeing what you did to make one of these work on a Nonsuch.

Many thanks,
Jim Cosgrove
FATE 30U #343
Galesville, MD