Thanks for posting those memory drop pictures. You saved me some questions later. Ive been collecting parts for an eventual scratch build.

The big stern drop banks are pretty rare, so I'm planning to use 2 4 bank drops instead. Should be a fun to mod them for the job.

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cottonm4

Great write up, I agree attempting to fuse the two 4 banks would be a mess. But I was planning different approach...

This was just my initial thought, I have not invested time working through details since my 9ball build is the 4th project in line currently.

But here was the initial plan:
Initial dry fit looked like I could mount the 2 banks separately. Not join them as you detailed (I agree that would be a lot of fab work!).

I saw the bigger challenge was to come up with a way to drive 2 separate reset coils where the game is set up for one. I assumed it was probably too much to drive both reset coils off a single transistor. The thought was to wire it up so the 2 separate transistors would be activated off the same circuit - each transistor driving a single rest coil. Again, didn't run this down very far this could be done by linking to an unused transistor on the driver board or by a separate circuit built up on a breadboard.

As far as the rest goes, one of my donor banks already has memory coils. This would require fab up of 3 home-made mechs for the non-memory target. I've got a bunch of EM relay coils & that could be build up similar to the stern resets coil/armature design where a "finger" activates the drop the target.