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Welcome back. Parts K4 are the internal formers for the torpedo housings, parts G1 and G2. It is mentioned on page 5 of the instructions, in the first step on the page. (When all else fails, read the instructions....)
I've built four different versions of the model (in three different scales) and have not had difficulty with parts B3 through B6. They fit fine for me with test fitting and occasionally cutting off tabs or making other adjustments.
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