In preparation of my new boiler being installed I've run some 10mm cable
from the CU to the gas pipes for earth bonding. However I can't work out how
you are supposed to attach the bonding clamps to the gas pipes. I'm using
these ones

http://tinyurl.com/e5hyu

I tried wrapping the 'tag' part around the pipe, back through the 'buckle'
and tightening the screw but it didn't make a particularly tight fit to the
pipe. Am I missing something or do I just nee to pull harder on the tag to
make it snug to the pipe.

Thanks

Jim