Even though the machine was bought 30 years ago, we overcame the problem by lubricating all the moving parts indicated in the manual with a silicone lubricant. We would have used a recognised sewing machine thin oil; but living deep in the French countryside, we didn't have access to an outlet and we had a deadline to meet for the work we were doing.
It now seems to be silent and smooth-running. The problem only arose when my wife changed her choice of settings from one of the ones she regularly uses to one that she had never used before. Thank you
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Hm, I think I'd take to a Bernina service repair. Just getting the outer case off without breaking it would be a challenge. You could probably just get a standard service, oil, and adjustment and ask them to take a look at the loose button and rattle. They may not even charge over and above the standard service fee.
Check with the folks at the yahoo group "wefixit" -- you may find a bobbin case there from a machine someone has parted out, or you can part out your machine. And/or check with Ron Anderson at A1 sewing: firstname.lastname@example.org -- he's always been helpful and has a good reputation for fast service, and telling you if something really isn't likely available and/or a machine isn't worth fixing. I've "known" him on the old usenet group alt.sewing for 20+ years, and he's always been helpful.
Older machines usually suffer from dried up oil and a build up of fuzz and lint. You'll need to do some serious cleaning and oiling. Look for trapped threads between moving parts. Use "liquid wrench" to clean capture drips and allow to soak for a bit. Then wipe down and use a good sewing machine oil.
Also if you mean that the needle is hitting something... that means the machine is out of time and needs to be timed.
I've tried to look up the manual for this but haven't found anything free for download. However there is a "608" that should at least give you some hints on what to do for your machine, oil points etc.
Get cleaned and oiled up really well... then if you still have bindinding issues check the timing.
Turn the handwheel until the take-up lever is at it's highest position.
Set the upper tension dial/knob to 5. The threading path is as follows:
From the spool around the top guide, down through the right slot, up the left slot, through the eye of the take-up lever from right to left, down through the guide(s), through the needle from front to back.