Unexplained BAYKO

This page is for anomalies that I cannot explain with any degree of certainty. It is perfectly possible that some at least may be the result of enthusiastic amateurs rather than Plimpton or MECCANO. The beauty lies in the fact that we, or at least I, cannot be certain, of some detail or other. At the moment I have just two items to include, but I will add others as they emerge.
If you can suggest credible explanations, or have any similarly unexplained items to share...
 
One of the definite positives of the MECCANO era was the groove in the middle of the reverse of various bricks. These were very helpful in the twiddly bits of more complex models, not least because of the extra strength the extra Rod affords to the structure. A great innovation!
Grooved Plimpton Era Brick, flat view
The brick shown here is the same plastic [not polystyrene] Brick that predominated in the 1950s.
However, if you look at the rear of the Brick, [right and left] you will see it is far from standard.
Grooved Plimpton era Brick, end view
The central groove has been modified with a deeper 'M' profile groove, for a Rod. This is the only such Plimpton era Brick I've ever seen.
Personally I think this would weaken the Brick much more than the MECCANO era groove with the semicircular cross-section.
I have to admit it is perfectly possible that this is the result of a home-made modification...
...however, there is no conclusive evidence, so it is just possible that this really was an unsuccessful Plimpton experiment.
 
This one, to me, is totally inexplicable...
Two different sizes of home made resin BAYKO Bases - animation
...don't get me wrong, even I can work out that they are home made.
Two different sizes of home made BAYKO Bases in wood and fibreboard - animation
The four images shown here are, self evidently, home grown substitutes for BAYKO Bases. The first two [left] are cut and drilled from solid blocks of a cast resin of some type, where as the other two [right] are cut from a piece of wood and a piece of fibre board.
Don't get me wrong, I know that when you build curved structures like Robert Palmer's fabulous model of the Leaning Tower of Pisa you've no choice.
However, these are all standard rectangles, though of differing sizes, and will have taken many, many hours of 'shed work' to produce. Given that BAYKO Bases have never been expensive items, the effective hourly rate to produce these cherished pieces would have embarassed most people in the Dickensian era, let alone the middle of the twentieth century - inexplicable!
 
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