Johnny Nero related... attached is a PCB design (schematics, BOM, and gerbers) for a clone of the Johnny Nero recoil driver board.
It's not a 100% reproduction, but should be a drop-in replacement (same size/shape), using the same parts, and roughly the same layout. It uses the same designators, so the schematics should also be useful for repairing an original board.
The parts are all currently in stock at Digikey - here's a cart share for convenience:
https://www.digikey.com/short/tpppqhm9 (<$10 in parts per board). Note that the BOM also has the P/Ns for the connector housings and crimp sockets if you need to build your own wiring harness.
I haven't built the board, and probably won't - at least for a while (not planning to make a special order for this)... so build/use at your own risk, and be sure to post if you build one and it works (or doesn't).
DogP