Bernina Q 24 Manual page 50

Quilting frame assembly
> Loosely tighten the hex nut (N2) from below, with the ribbed surface facing upward.
> Push the Y safety bracket (M14) all the way up to the rail and then pull it approximately 1 mm back.
– The Y safety bracket does not touch the rail.
1mm
> Hold the threaded nut securely with the open-ended wrench and then tighten the head cap screw (S10).
> Attach the other three Y safety brackets (M14) the same way.
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