It sounds like the same Supercourse curse that plagued my '77 SC with Weinmann Concave rims and ever-flat tires.

The bike was stolen in early-1979, it was orange, about 23". Maybe the same bike?

I thought I had the problem licked after discovering machining burrs inside the rim cavity from post-wheelbuild spoke shortening (done at the factory!). I filed and sanded the entire periphery of the rim's internal hollow bumps, but if this is the same bike, perhaps it wasn't enough?

So, it's a Raleigh, so first I'd check that no spoke length adjustments were done with a grinding wheel, post-build.

The Raleigh SuperCurse.

A flat tire - what's that?

It has to be Xenon gas to protect from aliens.

gremlins.

I've gone for years without doing any spoke length adjustment. Should I be worried?

Snookie.

Obvioulsy the work of FAFA, aka "Free Air For All". I've heard about them freeing captive air from birthday balloons, GI tracts and occasional beach balls....but really, bicycle tires....now they've gone to far!
http://cdn2.www.babble.com/wp-conten...os-434x325.jpg

Three Batmans and only one kid gets stuck being Robin? What is that? :(

That really sounds plausible and may account for some, but truly - this phenomenon is not limited to Raleigh or even post-build shortening of spokes.
(I never could comprehend how they allowed that on Factory-built wheels!)

Have you been resting your elbows on your table while eating again? You know that kills table fairies, don't you? You kill enough and the other fairies might be deciding to take revenge with pins.

Heh, on one Benotto I bought (in unused condition), the overlengthed spokes were left protruding 4-5 millimeters, poking up through (drumroll) Benotto striped handlebar tape installed at their factory.

And I've also seen wheels from Japan and elsewhere where the spoke and nipple itself showed heavy grinding, leaving razor-sharp edges that would readily cut through the rubber rim tape, especially if any spoke nipples were turned with the tire installed and inflated.
The Supercourse wheels were unique in that the grinding had obviously been done with the wheels rotating, lathe-style, and fixing all those flats was maddening.
Having the bike stolen (only shortly after the problem was finally discovered and fixed) was beyond maddening.

I'm voting for the wife also. Means, Opportunity. Motive.

Your wife, in the garage, with a hairpin.

Search her immediately. She may be hiding the hairpin in her mouth. Sarah Connor escaped from a mental hospital using only a paper clip. I saw it. That, and a syringe full of antifreeze, and a nightstick, and a cybernetic organism who had befriended her estranged son...

..........it's just you. My tires never go flat. And even if they did, it's just you.

With just the right amount of air your tires will be flat only on the bottom.