In an earlier contribution to this discussion,
djc wrote:


The original description was not as clear as it could be. Having
described a single section of carpet "with one gripper rod near the
bottom of each riser and another near the back of each tread" the
second clause "with the spikes pointing towards each other" might be
taken to refer to the same pair of grippers. Not a 'pair' composed of
adjacent riser tread pairs

Anyone familiar with gripper rod would have to try very hard to
mis-understand my original description. A single gripper rod is just that -
not a pair - and it has spikes angled in only one direction. So having
spikes pointing towards each other necessarily involved *both* of the rods
to which I had referred.
--
Cheers,
Roger
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