Originally Posted by niizh
The replacement blades for my olfa cutter has a hexagon or notched center, the blades at HF appear to be completely round. Does this cause a problem for anyone.
The notched edges around the center of an Olfa blade are for built-in obsolescence. In other words, they work kind of like a saw-blade, and will eventually saw off the post the blade is attached to, making it necessary to buy a new Olfa rotary cutter, not just replace the blades. That is what I heard another rotary cutter company explain at a booth at the Sewing Expo in Puyallup, WA a couple of years ago.
The Fiskars replacement blades are round in the center, exactly like the ones found at Harbor Freight. They have always worked perfectly well in my Olfa cutters, and are usually less expensive. Now, can't wait to go to town for a visit to Harbor Freight!!