I found this very unusual dual carb 1936 Knucklehead on YouTube, belongs to a Japanese rider,whats really unique is that those are 2 1915 era Schebler carbs attached to a intermediate manifold that bolts up to the M5 Linkert 3 bolt manifold that bolts up to the knuckle heads.
I couldnt enlarge the foto. The other interesting feature was the really slow idle and the fellow hooked up the shifter to the top motor mount. Just searching YouTube in Japanese script brings up a whole other world of genuine custom Knuckles, Panheads etc, No way in hell i can read the Japanese blogs on Japanese custom bikes, Amazing machines worthy of further research.
Production of all motorcycles in 1936 for HD was 9,812 motorbikes .
Koni has a Ebay "shop" for parts here
The above has to be a 1911,1912 or 1913 HD twin ,the engine below went in a bike like this.
A fellow i know recently discovered this 1913 HD twin engine. This technology is before a recirculating oil pump was introduced, note also no valve covers, they surface in 1914 models.
This flat block is where the Bosch magneto was positioned.
Early Schebler carburetor, HD later adopted Linkerts. 
I found this very unusual dual carb 1936 Knucklehead on YouTube, belongs to a Japanese rider,whats really unique is that those are 2 1915 era Schebler carbs attached to a intermediate manifold that bolts up to the M5 Linkert 3 bolt manifold that bolts up to the knuckle heads. 
U-995 at Kiel. One of four remaining WW2 U-boats left in the world, U-534 now in UKs Birkenhead, U-505 in Chicago, and CV 707 in Suomenlina, Helsinki Harbour Island in Finland. More info here...
Refueling, supply U-boats x 4.
Here one can see the narrow deck and the loading of torpedoes as an officer looks on.
