BENETEAU First 20 Owner's Manual page 106

Prepare the mast ashore by fitting the various wires.
Leave enough play in the diamond cap to allow the wire to slide.
Fit the upper swivel of the furling gear to the mast with its halyard (the halyard is outside and parallel to the forestay).
Adjustment method:
- Step the mast and tighten the wires by hand using the bottlescrews setting them up equally as you do so.
- Gradually tension the diamond using the bottlescrews to obtain the following values by using tensiometers:
- Check that the mast is completely straight in transverse position (No S).
It is normal to have a longitudinal forward curve with a semi-profile value in the centre.
- Tighten the outer shrouds using the bottlescrews to obtain the following value:
NOTE:
Gradually tighten each cable alternatively, since tensions are cumulative.
- Check that the mast is completely straight in transverse position (No S).
Handling, transport
Diamond: 12
Shrouds: 19
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Index A