I read about them for my 50 year old Delta after using only metal blocks for years. That's great. I saw on youtube where the guy just said put them in contact with the blade, use some wax on the blade, no overheating and found it to be true. This is a completely different saw now, no kidding. Round white plastic inserts are also available for the Peachtree table. After all these years watching youtube videos I finally got a saw that cuts straight without hesitation, with a better finish, still with the same old Bosch blade, nothing special, 3/8 blade. Should have done that many years ago. I would definitely use these blocks instead of ball bearing pulleys, they are very expensive to upgrade and I honestly don't see how they could be any better than these. It's actually better, because if they make contact (oops) with the blade's teeth, they shouldn't even damage it. Very impressive.
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