Carrier Aircraft Catapault Hold-Back Bar / Mechanism ?

Hello:

Retired Engineer.

Have always been interested in carrier catapaults.

I have tried to find a good, relatively technical, description on the web
with some diagrams or pix of the aircraft hold-back mechanism that's used
immediately prior to launch that restrains the plane.

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 ?

Thanks,
B.