After listening to water hammer on the pipes for the last 30 years I've
finally got round to doing something about it (best not to rush these
things) and fitted an arrestor -
http://www.toolstation.com/shop/Plum...SP/d/sd/p93058

I've had most of the plumbing in the house exposed at some time or other
but have never been able to find the source of the problem. Only a
couple of 3M or 4M stretches have never been able to be checked so I
fitted it in a section as close to what I presumed to be the source of
the hammer as possible.

It's not worked. Nothing has changed.

Do the arrestors work (if they're going to) as soon as they are fitted?

The top of it has what looks like a bicycle pump connector. Do I need to
get some pressure into it?

TIA

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F