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There must be a combination of PVC tubing that fits on itself snugly.
If the white PVC were engraved with black and red scale markings as a
regular plastic slide rule is then I think you would have something.

On Jul 3, 12:18�am,  wrote:
> A few years ago, when I and a couple of friends wanted each to own a gear 
hobbing machine, we cooperated. One made the casting patterns and saw them 
through the local foundry, another did the heavy machining and I did the 
small parts like feedscrews and their nuts. It occurs to me that several 
handy people could combine their skills to produce replica Bygraves slide 
rules. There will surely be someone who knows where to access tubing in which 
each size nests snuggly in the next largest size, someone else will know how 
to produce hard-wearing replica scales, another may be prepared to turn the 
bobbins at each end and I would volunteer to do small bits of metalwork. The 
results do not have to make profits, though a little would be nice. Since 
there seem to be very few surviving Bygraves calculators, one could at least 
have the satisfaction of owning a replica. The starting point of course would 
have to be accurate, dimensioned drawings of an original, preferably 
following the metric system, so the manufacturing consortium would not have 
to be confined to the USA.
>
> Any offers/takers?
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