 
Insert the shank into the blade's well from
the top of the blade. From below the blade, insert a conical tool such
as a large screwdriver blade at the level of the heel of the shank to push
the shank forward in the well. This will block the shank (see
diagram). When the holes are in line, insert the screw and tighten the
nut firmly. The supplied nut is a "Nylock" type and will not unscrew
itself (You should use a new nylock nut each time the anchor is
reassembled). All anchors are assembled at the factory before shipping
to be sure that the holes are in line.
How to connect
your Spade to your chain
There are a large number
of purpose built anchor connectors on the market, the majority of these are
simply inadequate and are prone to failure. They were originally
designed to overcome the problems associated with using a normal shackle
which tends to get caught on a bow roller during recovery. If this is
not likely to be a problem, we advise using a shackle of one size greater
than that of the chain. If the bow roller is likely to fail a shackle,
then use a rigging toggle as shown in the picture below.

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