I have bought 5 sets of 4 of these rollers for a project in the last 6 months. I couldn't buy them all at once due to limited quantity when ordering. When I unpacked them for use today I noticed that some kits had an oversized bearing cutout that allows the bearings to go in very freely and the outer race of the bearings rotates in the cutout where they are to be installed. They are generally not suitable for carrying loads because the bearing is not fixed in a recess that allows the bearing to rotate freely within the pulley. I want to replace defective kits, but the return period has expired. The last set I bought last week arrived today and is well made unlike the previous 4 sets. The bearing seats are neatly machined and the axle mount is made from much thicker steel.
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