Originally Posted by elcraft

I am a goldsmith, so i would use my Jewelers saw to carefully saw one end of the roller down. The blade would need to rest slightly against the buckle frame, slightly angled towards the roller. The sawing motion acts like filing the end of the roller. A demonstration would be so much more effective than my clumsy description. Harbor Freight has reasonably usable jewelers saw frames and blades available. The other option would be to remove the rivit, trim one end of the roller and make a new rivit from a common nail or some other wire of suitable diameter. I could perform the modification faster than explain it.