I got an entire seized Stanadyne DB2 on eBay for $50 and swapped the governor lid with the cutoff solenoid still in it onto a HMMWV pump to change it from 24V to 12V for my M1009. Leaves you with a lot of spare parts too. Came in handy for me.
Edited to add that when you reinstall the cover, you drop it on and slide it into position. You've got it right if you let it go and the spring pushes it out of place. If you get that lever behind the bit that actuates it, you've created a runaway condition. Always avoid if possible, but if you ever do get a runaway condition, pinch the fuel return line closed to kill the engine.