Doubt that they still use breakable (frangible) type of bolts, but perhaps ?
Do they ?

Anyone know of any good sources to learn more about how this is actually
done, and what
these mechanisms look like ?


I have one in front of me, from my first S-3 launch. My half (other
half stays in the shuttle until the deck crew discards it) looks like
half of a palm-sized purple yo-yo. Each a/c type used a different
color as each a/c had a slightly different holdback fitting.

v/r
Gordon