Last night, I took my Delta OSS apart to replace a bearing. I went to FastenAl's web site and looked at their selection of 6002 bearings. One bearing stood out from the rest. Their SKU# 4126048, priced at THREE THOUSAND, THREE HUNDRED, TWENTY-SEVEN DOLLARS, and FORTY EIGHT CENTS ($3,327.48) To say the least, I went with a MUCH CHEAPER bearing ($1.55.) This is for the newbies (and the olders who have forgotten), go to "thebigbearingstore.com" and scroll down page to "Bearing Library", and read how ball bearings are made.