etp7

Well I live about 80 miles through heavy traffic from a dealer and decided to do as much of the servicing as I can.
Bought some parts that probably don't need (305.247.03 Upper Cog Belt, Bernina #305.247.03) etc and oil/grease.
I have seen some videos on YouTube about basic oiling and cleaning but not greasing.

Biggest question is do the belts ever break or wear out?
Bought this in 1983 for my wife while I was a B-52 instructor pilot at Warner Robins on active duty.

Best purchase I ever made but at $1200 new that was a lot of money in those days/LOL.

Thanks,