1989 First 35s5 anchor roller

Mar 16, 2009
303
Hunter Vision-36 Richmond
Has anyone added a proper anchor roller to a First 35s5. The existing stem head fittings on these boats are custom cast aluminum and are too small for an anchor shank to fit between the roller and that pin above the roller. Or is that pin supposed to be removed when raising the anchor?
Any help would be appreciated.
Thanks,
Mike