Most people just raise some metal on the part that fits in the hub. A few little dings with a punch around the circumference usually does it
I have a triaxel trailer for my boat and it keeps throwing bearing buddies off while I am towing it. Is there a secret to keeping them on??
The diameter of your hubs is off. The manufacturer screwed up when they made those hubs or they had poor quality control. You will never get bearing buddies to fit as they should with the hubs you have. You need new quality hubs.
Doesn't mean that the hub diameter is correct, thus the bearing buddy may come off. The outside part of the hub may be incorrectly bored/cast.