I'm beginning to think the best way to get B14's is to just drill cores in B4-2,4,6 engines.
The B14 is a drilled B4. Proven by measurement.
Definitely against NAR schmafety code. Ask me if I give a RAT'S PATOOT !
Still leaves one without a B14-0 unless one removes the clay cap, ejection charge and delay.
I have used a home-brew B14-2 booster motor in the past in an old Astron Delta. It definitely flew higher with the 2 second coast between staging.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !