I use a Techsew SK5 bell skiver. The issue with its design is that the top feed roller is a tapered cylinder. This roller doesn't match the contour of the bell blade, therefore it takes a scalloped cut out of the leather rather than a flat skive. On bag panel edges, it's fine. But trying to take flat skive out of wallet components is near impossible. Is anyone aware of where I might be able to find a replacement roller that would match the contour of the blade?