. So these work and they're cheap, but be aware that there's a lot of room for user error in a product like this. The tolerances for a sliding linear guide to pass two of these are incredibly tight. Another quarter turn of a screw and the system locks up. You really want to add some fat or fat to them and your shaft too. They make a decent sound when the wave goes through them. Taking off a star because I had a bearing that had two threads screwed in incorrectly.
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