what is this part on 730 record?

1970 or earlier machines discussed here.
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what is this part on 730 record?

Postby emerald15 » Wed Mar 12, 2014 8:40 am

I have a Bernina 730 record circa 1969. Please could someone tell me what the large screw head on the back of the free arm does.. I think it's something to do with the foot pressure or an adjustment for thicker fabric (seems to make the needle go down deeper below the table). I 'accidentally' adjusted it when cleaning & now I'm not sure where I should re-set it back to.

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