LOCKING.--Now as regards locking the bolts. If split
pins are used, be sure to see that they are used in such a way
that the nut cannot possibly unscrew at all. The split pin
should be passed through the bolt as near as possible to the
nut. It should not be passed through both nut and bolt.
If it is locked by burring over the edge of the bolt, do not
use a heavy hammer and try to spread the whole head of
the bolt. That might damage the woodwork inside the
fabric-covered surface. Use a small, light hammer, and gently
tap round the edge of the bolt until it is burred over.
TURNBUCKLES.--A turnbuckle is composed of a central
barrel into each end of which is screwed an eye-bolt. Wires
are taken from the eyes of the eye-bolt, and so, by turning
the barrel, they can be adjusted to their proper tension.
Eye-bolts must be a good fit in the barrel; that is to say,
not slack and not very tight. Theoretically it is not neces-
sary to screw the eye-bolt into the barrel for a distance
greater than the diameter of the bolt, but, in practice, it is
better to screw it in for a considerably greater distance than
that if a reasonable degree of safety is to be secured.
Now about turning the barrel to secure the right adjustment.
The barrel looks solid, but, as a matter of fact, it
is hollow and much more frail than it appears. For that
reason it should not be turned by seizing it with pliers, as
that may distort it and spoil the bore within it.
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