In April of 2004 I purchased a Eagle America 196-9645 45 piece bearing survival kit. I have not had a reason to use the 1/4 inch pattern bearings until now. Today I attempted to use the 1/4 inch bearings and they appear to have an interference fit on nearly all the shafts of my router bits with the exception of only 2 or 3. The bearing ID measures
0.2490 to 0.2495. Most of my router shafts measure 0.249 as close as my calipers can measure. The diameter of the router bits that work to the ones that don't vary by such a small amount that my calipers (which have a precision to only 0.0005) are unable to show the difference between the shafts that work and those that don't. This tells me that the ones that work vs. the ones that don't vary by only a few 10ths of a thousanth. The same problem seems to be true with the 1/2 inch router bit shafts. I measured the 8 mm bearings and they appear to be 7.98 mm. (Actually, I have no use for the 8mm bearings, but they came with the kit). I have no problems with the 3/16 inch bearings that go on the top of the router bits.I wonder if these 1/4, 1/2 & 8mm bearings are designed for an interference fit? Has anyone gotten one of these kits or a similar kit? What are your experiences?