easiest way is if you can remove the inside part is to clamp in vise just tight enough to hold in place without crushing it and using a cut off wheel on your drill. If it does leave any burrs inside just use a small round file to remove. this is definitely fastest and easiest way. also if you want to cut inside part, wrap area to be cut with black tape where your mark is going to be and then cut. this will help to keep it from unraveling
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