[TR] Another Crazy Question: Beware, chestnut related

[TR3driver at ca.rr.com (Randall)]

> I replaced the copper 
> vacuum tube with a rubber tube that fits over that.  Is there 
> a Physics type reason that's a bad idea?

Should be fine, as long as the vacuum goes where it should and not where it
shouldn't.

IOW, make sure it fits snugly over the copper (or original steel) line at
the ends, and won't collapse under vacuum.

-- Randall