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how do i replace a cam gear on my bernina 707 sewing machine please?

I am tempted to buy a new cam gear stack for my sewing machine - the plastic has perished with age. But I'm worried if I undo the screws that hold it is place what will happen. Has anyone successfully managed to replace the gear part?
Bewildered, November 2011
Changing the top cam on a Bernina is very straight forward, you have nothing to lose by trying for yourself

ken, November 2011
link Click here to see other fixes for Bernina.