I use the Kevlar leader method and tie tubular elastic to that. Always at least double the length of the cords Estes uses in their kits. I think Estes uses JOKE-length cords as a conspiracy to sell more kits due to the inevitable damage upon ejection. Also lean toward same theory regarding "shotgun" ejection charges. The ejection charges in motors from the 70's to 90's were far more consistent and milder but plenty effective.

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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 !