WI Long Branch Arsenal got incomplete STEN drawings?

As the title suggests - early in WW2 - some STEN gun drawings sank on their voyage across the Atlantic Ocean. Then the two sample STENS were burned in a train wreck. The courier delivers them to Long Branch Arsenal but his nerves are so badly rattled that he stays drunk for the rest of the month.
The only tools to survive the voyage are for magazines, barrels and bolt faces.
A boxcar load of 9 x 19mm pistol ammo arrives the same day.
LBA engineers struggle make sense of the twisted samples and singed drawings. Baffled by the lack of drawings for a safety, telegraph questions to Enfield, but answers are so baffling that they are forced to reverse engineer the sub machine gun.
Sub contractors include a local auto body factory plus the usual mom-and-pop metal-working shops.
Every day, Ottawa calls demanding progress. Generals, politicians and captains of industry visit so often that they become a nuisance.
Generals want short range SMGs for house-clearing, motorcyclists and tankers.
Politicians want SMGs NOW!
Captains of industry demand simplifying production to depress prices.
Can Canadians manufacture them for less than $8.00 (Mark III)?
Do they get a full-length barrel-jacket like the MK III?
Do they add a side-folding butt stock?
Do they test fire a bull pup STEN?
Do they try inserting the magazine into the pistol grip (ala. UZI)?
How many of Rosciszewskis’ ideas are tested?
Does it get a bayonet lug?
When the first Canadian-made STEN returns from the test-range with fingerprints burned onto the barrel-jacket and a chunk of the soldier’s check frozen to the stock, LBA start adding wood and leather bits. How much leather? ... how much wood? ..... where?
 
Hey, my hometown!

You might have access to Enfield advisors- Massey-Harris had a massive plant just down the Canadian National Railway tracks, where they made Bren guns.

With a matter that urgent, they'd more than likely to get somebody to lean on somebody to get more plans.
 
The only tools to survive the voyage are for magazines, barrels and bolt faces.
That’s unfortunate since the biggest thing wrong with the STEN was the magazine. Can you lose those too?

To be honest you could probably just take a napkin sketch of “what a sten gun supposedly looks like”, a box of ammo, a barrel and a faced bolt on the train down to Windsor/Detroit, spend a week discussing things with various sheet metal experts and come up with a pretty decent solution. At the time that area might have held as much expertise on stamping things out of steel as the rest of the planet put together.
 
Hey, my hometown!

.......... Massey-Harris had a massive plant just down the Canadian National Railway tracks, where they made Bren guns.
........ .
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Let me get this straight: in your ATL, Inglis was so badly slandered - during the “Bren Gun Scandal of 1938” - that Ottawa orders them out of the MG business?
Did Inglis ever finish that initial batch of Bren barrels and magazines?
Were they delivered to Long Branch Arsenal un-marked ..... in the dead of night?

Did Massey-Harris ever receive a complete set of Bren drawings?
...... or did MH just continue with the Besal tools and samples they already had in-house?
How many CANSTENS did MH build before the end of the war?
Is there any truth to the rumour that MH’s first batch of Sten magazines jammed so often that they were all melted down?
Did MH modify CANSTEN bolt faces to match the new magazines?
 
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