I worked for two days on my Bernina 830 Record. I finally got the cracked camstack gear replaced and timed properly. I'm thrilled with it! I'm not so thrilled with the parts I received for it. One cam gear arrived with a small crack and looked to be made improperly. Sure, I'm going to this trouble to put in another broken gear? And I got new belts for it and after 45 days the lug belt cracked in 4 or 5 places. A $12 belt down the tubes. These parts are not genuine Bernina parts and they suck! In the future, I'm going to see if my dealer will get me the originals even if I have to pay more. So, if any of you are planning on working on Berninas in the future, buyer beware. I know several people here have problems in general with buying repro. parts made over seas. Make sure you inspect the parts carefully. I could return the cam gear (just under 30 days) but I'm out of pocket on the belt.