Here's a teardown of an Abus 72/30 with some tips on gutting them.
The keyway is fairly open but some with some warding. I've seen some other cores with different keyways but I don't have any to photograph.
To remove the core, unlock the padlock and depress the button in the shackle hole shown below, while sliding out the core. I used a shaped piece of wiper blade (the real narrow kind) as a probe.
Here are the core, body, shackle, bearings, and actuator. Note, there is no spring on the actuator or shackle.
Below shows the pin in a cutout in the back end of the bible that limits plug rotation. Depress this pin with a probe and rotate the core over 180 degrees.
Now is a good time to remove the keypins through the openings in the bottom of the core.
I have found that Euro cylinder tools work best for removal of these cores but a regular follower can be used with a slight modification of technique. Use the tool on the right to depress all the drivers and the pin which limited plug rotation.Then slide out the plug. If you choose to use a regular follower, be sure the plug is rotated so that no driver pins can drop into the channel that limits plug rotation, cut where the 6th pin could have been and possibly leave the keypins in as with other locks.
Below show shows tool placement and the plug out.
Here you can clearly see the pin and the channel it travels in which limits plug rotation.
Now all the pins are out you can see that all pins are standard and the drivers are balanced in length with the keypins.
The bible is very short in this core, so the drivers are cupped to allow the springs to go into the pin.
Now that its all apart make things a little more fun. Customize those pins and chambers to make for a fun picking challenge. Sorry, no photo examples as I'd hate to spoil the surprise for those who get these.
One tip for pin modification: due to the cupped drivers be very careful not to over tighten them in a dremel or drill chuck as they will deform easily.
