The instructions that come with this say it should be used with a headset press. Don't try to use just a bolt and washers or the bolt will slide off center as soon as it's under pressure and drive things in crooked and damage stuff. If you're going to use a bolt you need to use something to keep it centered. I used a hole saw to cut a piece of wood that just fit inside these parts, then drilled the center of that to allow the bolt to go through. You could probably find some plumbing parts that would act in the same way so a bolt will remain centered. Used that way it works great.
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