Technically, it's for the 820/830 machines, because the BSR runs at higher speeds, those who were having trouble with skipped stitches were offered the upgrade. But, I know some dealers are also doing them for the Artista/Aurora BSR feet as well. Same foot on all models.
They just replace the spring in it with a heavier duty one. It does help.
Originally Posted by kellen46
I have had my BSR for about five years and use it alot. I have not heard about the upgrade, tell me about it please....