Bobpat,
Bulk jewels offer a lot of jewels for the money. The problem is most repair guys, especially starting out, don’t have an accurate way to measure the ID and OD of friction jewels. There is a video on Youtube (The Watch Repair Channel) demonstrating pressing out, reaming, and pressing in a friction jewel. He also shows the measurment procedure he uses. Since he is English I would guess that he purchased the jewels from Cousins UK.
david