The studs on the Panasonic NiMH modules are nickel-plated steel, so they will attract a magnet.

Because the studs are nickel-plated steel, you want to use nickel-plated steel bolts, which you can verify by seeing whether they stick to a magnet.

I ran my fuel pump with a bench power supply, with the fuel line disconnected from the engine and a hose connected to it running to a gas jug, to pump the old fuel out of my tank.

Guide pins are supposed to be in the motor. If one sticks in the transmission when you pull an old motor out, you should yank it out before you install a new motor.